Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.20.4
Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 10, 2021
Feb. 09, 2021
Jan. 07, 2021
Jan. 03, 2021
Dec. 12, 2019
Aug. 16, 2018
Oct. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                    
Stock repurchased value               $ 923.5 $ 16.7 $ 746.1
Share repurchase program authorized amount             $ 1,500.0 $ 1,500.0    
Share repurchase program expiration date             Feb. 21, 2020 Oct. 30, 2023    
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate         1.75% 2.25%   1.75%    
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Eurodollar [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate         2.75% 3.25%   2.75%    
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate               2.50%    
Subsequent event [Member]                    
Subsequent Event [Line Items]                    
Share repurchase program authorized amount   $ 1,500.0                
Share repurchase program expiration date   Feb. 09, 2024                
Subsequent event [Member] | 2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate 1.75%                  
Subsequent event [Member] | 2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Eurodollar [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate 2.75%                  
Subsequent event [Member] | 2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate 2.50%                  
Subsequent event [Member] | Revolving credit facility [Member]                    
Subsequent Event [Line Items]                    
Proceeds from lines of credit     $ 150.0              
Subsequent event [Member] | Revolving credit facility [Member] | 2018 Credit Facility [Member] | Base Rate [Member] | Second Amendment [Member]                    
Subsequent Event [Line Items]                    
Interest rate spread on variable rate 1.50%                  
Subsequent event [Member] | Stock purchase agreement [Member] | Icahn Parties [Member] | Common Stock [Member]                    
Subsequent Event [Line Items]                    
Number of shares authorized to be repurchased       12,486,993            
Share price       $ 48.05            
Stock repurchased value       $ 600.0