Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Detail)

v3.23.3
Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Beginning balance $ (1,150.4) $ (1,415.4) $ (1,265.9) $ (1,391.5)  
Issuance of common shares from exercise of stock options, SARs, restricted stock units, employee stock purchase plan, and other 0.8 1.2 2.3 3.4  
Additional capital from share-based compensation 13.7 11.4 35.7 37.5  
Repurchases of common shares (0.3) (0.1) (9.7) (146.6)  
Retirement of treasury stock   0.0   0.0  
Net income 42.8 82.2 132.0 266.9  
Foreign currency translation adjustment, net of income taxes (15.5) (39.6) (0.7) (67.1)  
Unrealized gain/loss on derivatives, net of income taxes 0.4 (1.6) (2.2) (5.4)  
Other 0.0   5.0    
Retained earnings (accumulated deficit) (1,072.5) (59.1) (1,072.5) (59.1) $ (1,204.5)
Ending balance (1,103.5) (1,361.9) (1,103.5) (1,361.9)  
Common Shares [Member]          
Beginning balance 0.1 0.1 0.1 0.1  
Issuance of common shares from exercise of stock options, SARs, restricted stock units, employee stock purchase plan, and other 0.0 0.0 0.0 0.0  
Repurchases of common shares 0.0 0.0 0.0 0.0  
Ending balance 0.1 0.1 0.1 0.1  
Treasury Stock [Member]          
Beginning balance   (328.9)   (328.9)  
Retirement of treasury stock   328.9   328.9  
Ending balance   0.0   0.0  
Paid-in Capital in Excess of par Value [Member]          
Beginning balance 202.8 185.8 188.7 318.1  
Issuance of common shares from exercise of stock options, SARs, restricted stock units, employee stock purchase plan, and other 0.8 1.2 2.3 3.4  
Additional capital from share-based compensation 13.7 11.4 35.7 37.5  
Repurchases of common shares (0.3) (0.1) (9.7) (24.0)  
Retirement of treasury stock   (17.3)   (17.3)  
Other 5.0   5.0    
Ending balance 222.0 181.0 222.0 181.0  
Paid-in Capital in Excess of par Value [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Retained earnings (accumulated deficit)   (136.7)   (136.7)  
Accumulated Other Comprehensive Loss [Member]          
Beginning balance (238.0) (243.1) (250.2) (211.8)  
Foreign currency translation adjustment, net of income taxes (15.5) (39.6) (0.7) (67.1)  
Unrealized gain/loss on derivatives, net of income taxes 0.4 (1.6) (2.2) (5.4)  
Ending balance (253.1) (284.3) (253.1) (284.3)  
Accumulated Deficit [Member]          
Beginning balance (1,115.3) (1,029.3) (1,204.5) (1,169.0)  
Repurchases of common shares 0.0 0.0 0.0 (122.6)  
Retirement of treasury stock   (311.6)   (311.6)  
Net income 42.8 82.2 132.0 266.9  
Ending balance $ (1,072.5) (1,258.7) $ (1,072.5) (1,258.7)  
Accumulated Deficit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Retained earnings (accumulated deficit)   $ 77.6   $ 77.6