Stockholders' Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	$ 3,742.8	$ 4,656.8
Other comprehensive income (loss)	82.8	(43.4)
Balance end of period	3,809.4	4,755.2
Defined Pension and Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(218.8)
Other comprehensive income before reclassifications	0.0
Net losses (gains) reclassified from accumulated other comprehensive loss	1.9
Other comprehensive income (loss)	1.9
Balance end of period	(216.9)
Deferred Gains and Losses on Derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	8.9	(0.8)
Other comprehensive income before reclassifications	0.4	4.6
Net losses (gains) reclassified from accumulated other comprehensive loss	(1.7)	2.3
Other comprehensive income (loss)	(1.3)
Balance end of period	7.6	6.1
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(1,693.0)
Other comprehensive income before reclassifications	80.7
Net losses (gains) reclassified from accumulated other comprehensive loss	0.0
Other comprehensive income (loss)	80.7
Balance end of period	(1,612.3)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(1,902.9)	(1,708.1)
Other comprehensive income before reclassifications	81.1
Net losses (gains) reclassified from accumulated other comprehensive loss	0.2
Other comprehensive income (loss)	81.3
Balance end of period	$ (1,821.6)	$ (1,751.5)