Earnings Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income from continuing operations		$ 190.1	$ 287.8
Income from discontinued operations, net of income taxes		0.0	0.9
NET INCOME		$ 190.1	$ 288.7
Basic weighted average common shares outstanding (in shares)		42.0	47.2
Dilutive effect of unvested RSUs and stock options (in shares)		0.3	0.4
Diluted weighted average common shares outstanding (in shares)		42.3	47.6
Basic EPS amounts:
Continuing operations (in dollars per share)	[1]	$ 4.53	$ 6.10
Discontinued operations (in dollars per share)	[1]	0	0.02
Net income (in dollars per share)	[1]	4.53	6.12
Diluted EPS amounts:
Continuing operations (in dollars per share)	[1]	4.49	6.05
Discontinued operations (in dollars per share)	[1]	0	0.02
Net income (in dollars per share)	[1]	$ 4.49	$ 6.07

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