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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net income from continuing operations, net of loss attributable to non-controlling interests $ 348.8 $ 190.9 $ 118.3
Denominator:      
Denominator for basic earnings per common share—weighted average shares (in shares) 207.9 218.0 217.6
Effect of dilutive securities:      
Employee stock based compensation (in shares) 4.4 3.6 2.8
Denominator for diluted earnings per common share—adjusted weighted average shares (in shares) 212.3 221.6 220.4
Basic earnings per share for continuing operations (in dollars per share) $ 1.68 $ 0.87 $ 0.54
Diluted earnings per share for continuing operations (in dollars per share) $ 1.64 $ 0.86 $ 0.54
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)   4.4 6.0