Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	$ (1,294.1)
Reclassification to the statement of income	1.4
Change in fair value	25.9
Balance as of March 31, 2025	(1,230.6)
Retirement Plan Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	(2.8)
Reclassification to the statement of income	(0.1)
Balance as of March 31, 2025	(2.7)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	124.5
Change in fair value	22.2
Balance as of March 31, 2025	102.3
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	3.8
Reclassification to the statement of income	1.5
Change in fair value	3.7
Balance as of March 31, 2025	(1.4)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	125.5
Balance as of March 31, 2025	$ 98.2