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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent									$ 351.1	$ 656.0	$ 618.9
Weighted-average number of common shares outstanding, Basic									389.4	386.1	383.3
Restricted stock, stock options and other equity awards									3.8	5.1	5.7
Weighted-average number of common shares outstanding, Diluted									393.2	391.2	389.0
Basic	$ 0.29	$ 0.72	$ (0.12)	$ 0.01	$ 0.85	$ 0.43	$ 0.44	$ (0.02)	$ 0.90	$ 1.70	$ 1.61
Diluted	$ 0.28	$ 0.71	$ (0.12)	$ 0.01	$ 0.84	$ 0.42	$ 0.43	$ (0.02)	$ 0.89	$ 1.68	$ 1.59

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