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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Component of income from continuing operations and share data used in basic and diluted earnings per share | The following reflects income from continuing operations and share data used in the basic and diluted earnings per share computations using the two‑class method for the years ended December 31:
(in millions except share and per share amounts) |  | 2017 |  | 2016 |  | 2015
Income from continuing operations |  | $ | 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 |
Percent allocated to common shareholders (1) |  | 99.3 | % |  | 99.3 | % |  | 99.3 | %
|  | 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): |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  | 63,073 |  |  | 64,226 |  |  | 64,844 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Performance awards |  | 137 |  |  | 257 |  |  | 253 |
Stock options |  | 341 |  |  | 400 |  |  | 707 |
Adjusted weighted-average common shares outstanding and assumed conversion |  | 63,551 |  |  | 64,883 |  |  | 65,804 |
Per share income from continuing operations: |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.75 |  |  | $ | 3.87 |  |  | $ | 4.89 |
Diluted |  | $ | 5.71 |  |  | $ | 3.83 |  |  | $ | 4.82 |
(1) 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 |  | 99.3 | % |  | 99.3 | % |  | 99.3 | %
Component of income (loss) from discontinued operations and share data used in basic and diluted earnings per share | The income from discontinued operations and net income for the years ended December 31 follows:
(in millions except share amounts presented in thousands) |  | 2017 |  | 2016 |  | 2015
Income (loss) from discontinued operations |  | $ | 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 |
Anti-dilutive stock options excluded from EPS calculation (1) |  | 320.6 |  |  | 23.1 |  |  | 257.5 |
(1) Represents stock options excluded from the calculation of diluted earnings per share as such options’ assumed proceeds upon exercise would result in the repurchase of more shares than the underlying award.

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- Definition Tabular disclosure of income (loss) from discontinued operations and net income attributable to common shareholders used in the computation of earnings per share. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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