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Stockholders' Equity - Schedule of Adjustments to Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized net gains (losses) on defined benefit pension plan $ 3.1 $ 69.2 $ (45.5) $ 113.5
Unrealized gains (losses) on interest rate swaps 3.1 69.2 (45.5) 113.5
Other comprehensive (loss) income before reclassifications, Tax Effect (0.3) (3.1) 0.7 (5.3)
Defined Benefit Obligation [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized net gains (losses) on defined benefit pension plan 0.0 (0.1) 0.0 (0.1)
Reclassification of losses into net earnings on defined benefit pension, Tax Effect 0.1 0.1 0.1 0.1
Unrealized gains (losses) on interest rate swaps 0.0 (0.1) 0.0 (0.1)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized net gains (losses) on defined benefit pension plan 3.1 69.3 (45.5) 113.6
Unrealized gains (losses) on interest rate swaps 3.1 69.3 (45.5) 113.6
Other comprehensive (loss) income before reclassifications, Tax Effect $ (0.4) $ (3.1) $ 0.6 $ (5.4)