Quarterly report [Sections 13 or 15(d)]

Long-Term Debt - Additional Information (Detail)

v3.25.2
Long-Term Debt - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 16, 2018
USD ($)
Jun. 30, 2025
USD ($)
Feb. 28, 2025
USD ($)
Apr. 30, 2024
USD ($)
May 31, 2021
USD ($)
May 31, 2020
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2022
USD ($)
Days
$ / shares
Dec. 31, 2024
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Debt Instrument [Line Items]                            
Outstanding principal amount   $ 2,206.5         $ 2,206.5   $ 2,206.5          
Credit facility, amount borrowed                   $ 988.5        
Gain on extinguishment of debt                 0.0 (10.5)        
Interest expense             55.4 $ 60.4 110.0 102.0        
Letters of credit issued but undrawn   143.6         143.6   143.6          
4.250% Convertible Senior Notes Due 2028 [Member]                            
Debt Instrument [Line Items]                            
Outstanding principal amount   $ 277.5         277.5   277.5   $ 277.5 $ 277.5    
Deferred financing costs                     8.5      
Aggregate principal amount of senior notes issued                     250.0      
Convertible debt underwriters over allotment option fully exercised                     37.5      
Interest expense             3.3 4.0 6.6 7.3        
Amortization of deferred financing costs             $ 0.4 0.4 $ 0.8 0.7        
Additional principal amount of convertible notes                     $ 27.5      
Convertible notes, interest rate   4.25%         4.25%   4.25%   4.25%      
Line of credit maturity                 Jun. 15, 2028   Jun. 15, 2028      
Principal amount of convertible notes                     $ 1,000.0      
Convertible notes conversion rate                     58.8998      
Convertible notes conversion price | $ / shares                     $ 16.98      
Effective interest rate on convertible notes                     4.90%      
Fair value of liability to convertible notes   $ 253.6         $ 253.6   $ 253.6     215.3    
Convertible notes, conversion feature                 Holders of the 2028 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2023, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2028 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2028 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2028 Convertible Notes for each such day; (iii) if the Company calls the 2028 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after March 15, 2028, holders may convert their 2028 Convertible Notes at any time, regardless of the foregoing circumstances.          
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Days                     20      
Convertible notes, number of trading days of threshold limit in consecutive days | Days                     30      
Minimum percentage of common share price over conversion price for conversion                     130.00%      
Minimum percentage of the product of common share price and conversion rate for convertible notes                     98.00%      
Unamortized debt discount and debt issuance costs   4.8         4.8   $ 4.8     5.6    
Convertible senior notes, carrying value   272.7         272.7   272.7     271.9    
7.875% Senior Notes Due 2025 [Member]                            
Debt Instrument [Line Items]                            
Outstanding principal amount   147.3         147.3   147.3     262.3    
Deferred financing costs   0.0         0.0   0.0     0.5   $ 7.9
Aggregate principal amount of senior notes issued   50.0 $ 65.0 $ 300.0   $ 600.0 50.0   50.0          
Debt instrument , Purchase Price   51.3 67.3 309.1                    
Accrued interest   $ 1.3 $ 2.3 3.2     1.3   1.3          
Reduction to long term debt       298.8                    
Gain on extinguishment of debt       7.1       0.9            
Interest expense             4.1 6.8 8.8 19.0        
Amortization of deferred financing costs             $ 0.2 0.2 $ 0.5 0.6        
Convertible notes, interest rate   7.875%       7.875% 7.875%   7.875%          
Line of credit maturity           Sep. 01, 2025     Jan. 09, 2025          
Carrying amount   $ 147.3         $ 147.3   $ 147.3     261.8    
7.875% Senior Notes Due 2025 [Member] | Debt Issuance Costs [Member]                            
Debt Instrument [Line Items]                            
Deferred financing costs                           $ 7.9
7.875% Senior Notes Due 2025 [Member] | Level 2 [Member]                            
Debt Instrument [Line Items]                            
Fair value of notes   147.8         147.8   147.8     263.0    
4.875% Senior Notes Due 2029 [Member]                            
Debt Instrument [Line Items]                            
Outstanding principal amount   600.0         600.0   600.0     600.0    
Deferred financing costs   $ 4.2         4.2   4.2     4.6 $ 7.7  
Aggregate principal amount of senior notes issued         $ 600.0                  
Interest expense             7.6 7.6 15.1 15.1        
Amortization of deferred financing costs             $ 0.3 0.3 $ 0.5 0.5        
Convertible notes, interest rate   4.875%     4.875%   4.875%   4.875%          
Line of credit maturity         Jun. 01, 2029       Jan. 06, 2029          
Carrying amount   $ 595.8         $ 595.8   $ 595.8     595.4    
Fair value of notes   $ 511.3         $ 511.3   $ 511.3     $ 421.5    
4.875% Senior Notes Due 2029 [Member] | Debt Issuance Costs [Member]                            
Debt Instrument [Line Items]                            
Deferred financing costs                         $ 7.7  
SOFR                            
Debt Instrument [Line Items]                            
Base rate interest rate floor                 0.00%          
2018 Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Line of credit maturity                 Mar. 19, 2025          
2018 Term Loan A [Member]                            
Debt Instrument [Line Items]                            
Line of credit maturity                 Mar. 19, 2025          
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 0.75%          
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 1.25%          
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | SOFR | Minimum [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 1.75%          
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | SOFR | Maximum [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 2.25%          
2018 Term Loan B [Member]                            
Debt Instrument [Line Items]                            
Line of credit maturity                 Aug. 18, 2025          
Separately 2025 Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount of senior notes issued       37.7                    
Debt instrument , Purchase Price       38.9                    
Accrued interest       0.5                    
Senior notes carrying value       $ 37.5                    
2018 Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum amount $ 1,250.0                          
Credit facility, amount borrowed                   200.0        
Interest expense               18.5   37.4        
Amortization of deferred financing costs               $ 0.6   $ 1.4        
2018 Credit Facility [Member] | Base Rate [Member]                            
Debt Instrument [Line Items]                            
Base rate interest rate floor                 1.00%          
2018 Credit Facility [Member] | Federal Funds Rate [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 0.50%          
2018 Credit Facility [Member] | SOFR                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 1.00%          
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum amount $ 250.0                          
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%                          
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%                          
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Fourth Amendment [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum amount $ 330.0                          
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of one month                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate 0.11%                          
2018 Credit Facility [Member] | 2018 Term Loan A [Member]                            
Debt Instrument [Line Items]                            
Outstanding principal amount $ 250.0                          
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Fourth Amendment [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum amount 286.2                          
2018 Credit Facility [Member] | 2018 Term Loan B [Member]                            
Debt Instrument [Line Items]                            
Outstanding principal amount $ 750.0                          
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 1.50%          
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | SOFR                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate                 2.50%          
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of three month                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate 0.26%                          
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term Sofr interest periods of six month                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate 0.43%                          
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of twelve month                            
Debt Instrument [Line Items]                            
Interest rate spread on variable rate 0.72%