Earnings Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income from continuing operations		$ 352.7			$ 361.7			$ 1,091.3	$ 986.1
Loss from discontinued operations, net of income taxes		(0.1)			0.0			(0.3)	(0.2)
NET INCOME		$ 352.6	$ 376.3	$ 362.1	$ 361.7	$ 384.8	$ 239.4	$ 1,091.0	$ 985.9
Basic weighted average common shares outstanding (in shares)		55.5			69.9			58.5	77.3
Dilutive effect of unvested RSUs and stock options (in shares)		0.4			0.8			0.4	0.8
Diluted weighted average common shares outstanding (in shares)		55.9			70.7			58.9	78.1
Basic EPS amounts:
Continuing operations (in dollars per share)	[1]	$ 6.35			$ 5.17			$ 18.65	$ 12.76
Discontinued operations (in dollars per share)	[1]	0			0			(0.01)	0
Net income (in dollars per share)	[1]	6.35			5.17			18.65	12.75
Diluted EPS amounts:
Continuing operations (in dollars per share)	[1]	6.31			5.12			18.53	12.63
Discontinued operations (in dollars per share)	[1]	0			0			(0.01)	0
Net income (in dollars per share)	[1]	$ 6.31			$ 5.12			$ 18.52	$ 12.62

[1] (1) EPS amounts are calculated discretely and, therefore, may not add up to the total due to rounding.