Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Income from continuing operations, net of income (loss) attributable to non-controlling interests	$ 177.5	$ 119.0	$ 449.3	$ 202.8
Denominator:
Denominator for basic earnings per common share-weighted average shares (in shares)	195.8	206.4	198.9	208.8
Effect of dilutive securities (in shares)	7.6	5.2	7.0	2.8
Denominator for diluted earnings per common share-adjusted weighted average shares (in shares)	203.4	211.6	205.9	211.6
Basic earnings per share for continuing operations (in dollars per share)	$ 0.91	$ 0.58	$ 2.26	$ 0.97
Diluted earnings per share for continuing operations (in dollars per share)	$ 0.87	$ 0.56	$ 2.18	$ 0.96
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)				0.5