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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Income from continuing operations, net of income attributable to non-controlling interests $ 22.9 $ 42.8 $ 83.8 $ 71.6
Denominator:        
Denominator for basic earnings per common share-weighted average shares (in shares) 51.6 54.7 52.5 54.7
Effect of dilutive securities:        
Employee stock-based compensation (in shares) 0.4 1.3 0.5 0.9
Denominator for diluted earnings per common share-adjusted weighted average shares 52.0 56.0 53.0 55.6
Basic earnings per share for continuing operations (in dollars per share) $ 0.44 $ 0.78 $ 1.60 $ 1.31
Diluted earnings per share for continuing operations (in dollars per share) $ 0.44 $ 0.76 $ 1.58 $ 1.29
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) 1.3 1.1 0.8 1.1