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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Income from continuing operations, net of income attributable to non-controlling interests $ 119.0 $ 72.5 $ 202.8 $ 144.1
Denominator:        
Denominator for basic earnings per common share-weighted average shares (in shares) 51,600,000 54,600,000 52,200,000 54,700,000
Effect of dilutive securities:        
Employee stock-based compensation (in shares) 1,300,000 1,200,000 700,000 1,300,000
Denominator for diluted earnings per common share-adjusted weighted average shares (in shares) 52,900,000 55,800,000 52,900,000 56,000,000.0
Basic earnings per share for continuing operations (in dollars per share) $ 2.31 $ 1.33 $ 3.89 $ 2.63
Diluted earnings per share for continuing operations (in dollars per share) $ 2.25 $ 1.30 $ 3.83 $ 2.57
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)   0 500,000 1,100,000