Stockholders' Equity (Schedule of Stockholders' Equity) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	$ 4,656.8	$ 3,882.6
Stock compensation	8.4	14.0
Issuance of stock awards	(12.9)	(18.4)
SSARs exercised	(0.1)	(1.1)
Comprehensive income:
Net income	168.0	232.6
Other comprehensive (loss) income:
Foreign currency translation adjustments	(52.0)	44.4
Defined benefit pension plans, net of tax	1.7	1.8
Deferred gains and losses on derivatives, net of tax	6.9	0.5
Payment of dividends to stockholders	(21.6)	(18.0)
Balance end of period	4,755.2	4,132.9	$ 3,882.6
Accounting Standards Update [Extensible Enumeration]			Accounting Standards Update 2016-13 [Member]
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period		(5.5)
Other comprehensive (loss) income:
Balance end of period			$ (5.5)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	0.7	0.7
Other comprehensive (loss) income:
Balance end of period	0.7	0.7	0.7
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	4.1	30.2
Stock compensation	8.4	14.0
Issuance of stock awards	(12.4)	(18.4)
SSARs exercised	(0.1)	(1.1)
Other comprehensive (loss) income:
Balance end of period	0.0	24.7	30.2
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	6,360.0	5,654.6
Issuance of stock awards	(0.5)
Comprehensive income:
Net income	168.0	232.6
Other comprehensive (loss) income:
Payment of dividends to stockholders	(21.6)	(18.0)
Balance end of period	6,505.9	5,863.7	5,654.6
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period		(5.5)
Other comprehensive (loss) income:
Balance end of period			(5.5)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	(1,708.1)	(1,803.1)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(52.0)	44.4
Defined benefit pension plans, net of tax	1.7	1.8
Deferred gains and losses on derivatives, net of tax	6.9	0.5
Balance end of period	(1,751.5)	(1,756.4)	(1,803.1)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period	0.1	0.2
Other comprehensive (loss) income:
Foreign currency translation adjustments		0.0
Balance end of period	$ 0.1	$ 0.2	$ 0.2