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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 115.1 | $ 86.4 | $ 102.3 | $ 61.5 | $ 76.5 | $ (9.5) | $ 115.3 | $ 68.5 | $ 365.3 | $ 250.8 | $ 319.6
Less: dividends declared - common stock outstanding, restricted shares and restricted share units |  |  |  |  |  |  |  |  | (92.1) | (84.5) | (72.3)
Undistributed earnings |  |  |  |  |  |  |  |  | 273.2 | 166.3 | 247.3
Undistributed earnings allocated to common shareholders |  |  |  |  |  |  |  |  | 271.3 | 165.0 | 245.6
Add: dividends declared - common stock |  |  |  |  |  |  |  |  | 90.9 | 83.6 | 71.4
Income from continuing operations attributable to common shares |  |  |  |  |  |  |  |  | $ 362.2 | $ 248.6 | $ 317.0
Shares (in thousands): |  |  |  |  |  |  |  |  |  |  |
Denominator for basic EPS: weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 63,073 | 64,226 | 64,844
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Performance awards (in shares) |  |  |  |  |  |  |  |  | 137 | 257 | 253
Stock options (in shares) |  |  |  |  |  |  |  |  | 341 | 400 | 707
Denominator for diluted EPS: adjusted weighted-average common shares outstanding and assumed conversion |  |  |  |  |  |  |  |  | 63,551 | 64,883 | 65,804
Per share income from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.84 | $ 1.38 | $ 1.59 | $ 0.95 | $ 1.18 | $ (0.15) | $ 1.78 | $ 1.06 | $ 5.75 | $ 3.87 | $ 4.89
Diluted (in dollars per share) | $ 1.82 | $ 1.37 | $ 1.58 | $ 0.94 | $ 1.17 | $ (0.15) | $ 1.75 | $ 1.05 | $ 5.71 | $ 3.83 | $ 4.82
Basic weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 63,073 | 64,226 | 64,844
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units |  |  |  |  |  |  |  |  | 63,513 | 64,682 | 65,304
Percent allocated to common shareholders |  |  |  |  |  |  |  |  | 99.30% | 99.30% | 99.30%
Income (loss) from discontinued operations and net income |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share |  |  |  |  |  |  |  |  | $ 0.2 | $ (0.7) | $ 0.1
Net income attributable to common shareholders for basic and diluted earnings per share |  |  |  |  |  |  |  |  | $ 362.4 | $ 248.0 | $ 317.1
Antidilutive stock options excluded from EPS calculation (in shares) |  |  |  |  |  |  |  |  | 320,600 | 23,100 | 257,500

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