Earnings Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income from continuing operations	$ 1,373.3	$ 381.8	$ 450.8
Loss from discontinued operations, net of income taxes	(0.3)	(0.2)	(0.8)
Net income	$ 1,373.0	$ 381.6	$ 450.0
Basic weighted average common shares outstanding (in shares)	74.2	88.3	90.1
Dilutive effect of stock options and unvested RSUs (in shares)	0.8	0.4	0.4
Diluted weighted average common shares outstanding (in shares)	75.0	88.7	90.5
Basic EPS amounts
Continuing operations (in dollars per share)	$ 18.51	$ 4.32	$ 5.00
Discontinued operations (in dollars per share)	0	0	(0.01)
Net income (in dollars per share)	18.50	4.32	4.99
Diluted EPS amounts:
Continuing operations (in dollars per share)	18.31	4.30	4.98
Discontinued operations (in dollars per share)	0	0	(0.01)
Net income (in dollars per share)	$ 18.31	$ 4.30	$ 4.97