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Net Income Per Common Share Computations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  | $ 182.6 | $ 122.4 | $ 96.7
Net income from continuing operations allocated to participating securities |  |  |  |  |  |  |  |  | 0.0 | (0.1) | (1.0)
Net income from discontinued operations | $ 4.1 | $ (1.7) | $ (0.1) | $ 167.9 | $ 3.8 | $ 3.8 | $ 5.4 | $ 5.1 | 170.2 | 18.1 | 11.4
Numerator for basic net income per common share |  |  |  |  |  |  |  |  | 352.8 | 140.4 | 107.1
Numerator for diluted net income from continuing operations per common share |  |  |  |  |  |  |  |  | 182.6 | 122.4 | 96.7
Numerator for diluted net income per common share |  |  |  |  |  |  |  |  | $ 352.8 | $ 140.5 | $ 108.1
Denominator for net income per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  |  |  |  |  |  |  |  | 41.3 | 47.2 | 49.3
Plus dilutive effect of stock awards (in shares) |  |  |  |  |  |  |  |  | 0.3 | 0.6 | 0.6
Plus dilutive effect of participating securities (in shares) |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 0.6
Diluted (in shares) |  |  |  |  |  |  |  |  | 41.6 | 48.0 | 50.5
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.18 | $ 1.43 | $ 2.54 | $ 0.33 | $ 0.75 | $ 0.28 | $ 1.50 | $ 0.04 | $ 4.42 | $ 2.59 | $ 1.94
Discontinued operations (in dollars per share) | 0.10 | (0.04) | 0.00 | 3.88 | 0.08 | 0.08 | 0.11 | 0.11 | 4.12 | 0.38 | 0.23
Net income per common share - basic (in dollars per share) | 0.28 | 1.39 | 2.54 | 4.21 | 0.83 | 0.36 | 1.61 | 0.15 | 8.54 | 2.97 | 2.17
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | 0.18 | 1.42 | 2.52 | 0.32 | 0.74 | 0.28 | 1.49 | 0.04 | 4.39 | 2.55 | 1.92
Discontinued operations (in dollars per share) | 0.10 | (0.04) | 0.00 | 3.86 | 0.08 | 0.08 | 0.11 | 0.10 | 4.09 | 0.37 | 0.22
Net income per common share - diluted (in dollars per share) | $ 0.28 | $ 1.38 | $ 2.52 | $ 4.18 | $ 0.82 | $ 0.36 | $ 1.60 | $ 0.14 | $ 8.48 | $ 2.92 | $ 2.14

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