Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	$ 4,656.8	$ 3,882.6
Other comprehensive (loss) income	(43.4)	46.7
Balance end of period	4,755.2	4,132.9
Defined Benefit Pension Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(238.6)
Other comprehensive income (loss) before reclassifications	0.0
Net losses reclassified from accumulated other comprehensive loss	1.7
Other comprehensive (loss) income	1.7
Balance end of period	(236.9)
Deferred Net (Losses) Gains on Derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(0.8)
Other comprehensive income (loss) before reclassifications	4.6
Net losses reclassified from accumulated other comprehensive loss	2.3
Other comprehensive (loss) income	6.9
Balance end of period	6.1
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(1,468.7)
Other comprehensive income (loss) before reclassifications	(52.0)
Net losses reclassified from accumulated other comprehensive loss	0.0
Other comprehensive (loss) income	(52.0)
Balance end of period	(1,520.7)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(1,708.1)	(1,803.1)
Other comprehensive income (loss) before reclassifications	(47.4)
Net losses reclassified from accumulated other comprehensive loss	4.0
Other comprehensive (loss) income	(43.4)
Balance end of period	$ (1,751.5)	$ (1,756.4)