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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income (loss)	$ 516.3	$ 285.0
Subtract:
Net income (loss) attributable to noncontrolling interest	(0.8)	(3.9)
Adjustments to redemption amounts of redeemable noncontrolling interests	1.9
Total	$ 515.2	$ 288.9
Weighted-average shares outstanding:
Basic	272.9	275.0
Dilutive effects:
Diluted	276.0	277.2
Net income (loss) per common share:
Basic	$ 1.89	$ 1.05
Diluted	$ 1.87	$ 1.04
Nonqualified Stock Options
Dilutive effects:
Stock-based compensation awards	0.8	0.5
Restricted Stock Units
Dilutive effects:
Stock-based compensation awards	2.0	1.6
Performance Share Awards
Dilutive effects:
Stock-based compensation awards	0.3	0.1

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