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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations, net of loss attributable to non-controlling interests | $ 19.1 | $ 44.1 | $ 26.6 | $ 25.6 | $ 63.7 | $ 53.2 | $ 22.1 | $ 32.6 | $ 118.3 | $ 182.3 | $ 202.9
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per common share—weighted average shares |  |  |  |  |  |  |  |  | 54.4 | 54.0 | 59.0
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee stock based compensation (in shares) |  |  |  |  |  |  |  |  | 0.7 | 0.7 | 0.8
Denominator for diluted earnings per common share—adjusted weighted average shares (in shares) |  |  |  |  |  |  |  |  | 55.1 | 54.7 | 59.8
Earnings per share for continuing operations, basic (in dollars per share) | $ 0.35 | $ 0.83 | $ 0.52 | $ 0.48 | $ 1.22 | $ 1.05 | $ 0.46 | $ 0.64 | $ 2.17 | $ 3.37 | $ 3.44
Earnings per share for continuing operations, diluted (in dollars per share) | $ 0.35 | $ 0.82 | $ 0.52 | $ 0.47 | $ 1.21 | $ 1.03 | $ 0.46 | $ 0.63 | $ 2.15 | $ 3.33 | $ 3.39
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 1.5 | 1.3 | 0.4

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