Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	$ (1,294.1)
Reclassification to the statement of income	0.8
Change in fair value	84.0
Balance as of September 30, 2025	(1,153.9)
Retirement Plan Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	(2.8)
Reclassification to the statement of income	(0.3)
Balance as of September 30, 2025	(2.5)
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
Balance as of September 30, 2025	45.2
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	1.1
Change in fair value	4.7
Balance as of September 30, 2025	(2.0)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2024	125.5
Balance as of September 30, 2025	$ 40.7