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Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 01, 2024
USD ($)
shares
Mar. 15, 2023
USD ($)
shares
May 10, 2022
shares
Jun. 30, 2024
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
shares
Jun. 30, 2024
USD ($)
TIME
shares
Jun. 30, 2023
USD ($)
shares
Dec. 31, 2023
shares
Mar. 31, 2022
shares
Mar. 15, 2022
USD ($)
shares
Mar. 16, 2021
USD ($)
shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Share-based compensation, shares outstanding | shares       7,800,000       7,800,000   7,900,000      
Officer and Key Employees [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Performance awards period, years               1 year          
Restricted Stock Units (RSUs) [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Share based payment award vesting date         Mar. 01, 2029   Mar. 15, 2028            
Restricted stock or unit expense       $ 14.1   $ 11.0   $ 27.0 $ 20.7        
Unvested Restricted Stock [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Total intrinsic value       512.7   460.5   512.7 460.5        
Equity awards with an aggregate fair value               93.3 62.0        
Performance Shares [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Restricted stock or unit expense       5.6   3.8   10.6 8.5        
Total intrinsic value       85.2   64.3   85.2 64.3        
Equity awards with an aggregate fair value               $ 31.6 $ 28.9        
Performance share awards approved, Fair value $ 14.2 $ 10.3                      
Vesting period, years 3 years 3 years                      
Performance Shares [Member] | Executive Officer [Member] | Minimum [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Minimum age of employee with not subject to award forfeiture on condition compliance 62 years 62 years                      
2017 Performance Share Awards [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Provisional awards, terms               The 2024 and 2023 awards are subject to a three-year performance period that began on January 1, 2024 and 2023, respectively, and vest on the three-year anniversary of the date of grant (March 1, 2027 and March 15, 2026).          
Cash Awards [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Shares granted in the period | shares               0 0        
Cash Awards [Member] | Officer and Key Employees [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Provisional awards, terms               The ultimate award value will be equal to the trailing twelve-month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date.          
Vesting period, years               3 years          
Provisional compensation cash awards approved for future grant by compensation committee, value                       $ 19.9 $ 18.8
Provisional compensation cash award approved for future grant by compensation committee, units | shares                       125,000 147,000
Ultimate award value, multiples of original value of the units, minimum | TIME               0.5          
Ultimate award value, multiples of original value of the units, maximum | TIME               1.5          
2022 Provisional Cash Awards [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Cash-based compensation awards, expenses       $ 3.3   3.1   $ 6.7 $ 5.7        
2021 Provisional Cash Awards [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Provisional compensation cash award approved for future grant by compensation committee, units | shares       129,000       129,000          
Cash-based compensation awards, expenses           $ 3.2     $ 6.5        
Cash award with aggregate fair value vested and distributed to participants               $ 25.4          
Performance awards expiration date               Jan. 01, 2024          
2021 Provisional Cash Awards [Member] | Officer and Key Employees [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Provisional compensation cash award approved for future grant by compensation committee, units | shares                     143,000    
2020 Provisional Cash Awards [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Provisional compensation cash award approved for future grant by compensation committee, units | shares           191,000     191,000        
Cash award with aggregate fair value vested and distributed to participants                 $ 24.7        
Long Term Incentive Plan [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Share-based compensation, shares outstanding, Value       $ 4.0       $ 4.0          
Shares granted in the period | shares     3,500,000         2,500,000          
Long Term Incentive Plan [Member] | Minimum [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Period of service from grant date stock options awarded not subject to forfeiture   2 years             2 years        
Long Term Incentive Plan [Member] | Executive Officer [Member] | Minimum [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Minimum age of employee with not subject to award forfeiture on condition compliance               62 years 55 years        
Long Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Shares granted in the period | shares         345,000   378,000            
Fair value of grants in period         $ 83.9   $ 67.0            
Long Term Incentive Plan [Member] | Performance Shares [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Shares authorized | shares 58,000 58,000                      
Long Term Incentive Plan [Member] | Performance Shares [Member] | Executive Officer [Member] | Minimum [Member]                          
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                          
Minimum age of employee with not subject to award forfeiture on condition compliance   55 years