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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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:
|  | Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
(in millions, except share and per share amounts) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Income from continuing operations |  | $ | 96.9 |  | $ | 79.1 |  | $ | 269.5 |  | $ | 231.7
Less: dividends declared on common stock outstanding, restricted shares and restricted share units |  | (24.1) |  | (23.2) |  | (69.7) |  | (69.0)
Undistributed earnings |  | 72.8 |  | 55.9 |  | 199.8 |  | 162.7
Percent allocated to common shareholders1 |  | 99.3 | % |  | 99.3 | % |  | 99.3 | % |  | 99.4 | %
|  | 72.3 |  | 55.5 |  | 198.4 |  | 161.6
Add: dividends declared on common stock |  | 23.8 |  | 23.2 |  | 69.0 |  | 68.1
Income from continuing operations attributable to common shares |  | $ | 96.1 |  | $ | 78.7 |  | $ | 267.4 |  | $ | 229.7
Shares (in thousands): |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  | 59,826 |  | 62,432 |  | 60,712 |  | 63,503
Effect of dilutive securities: |  |  |  |  |  |  |  |
Performance awards |  | 118 |  | 82 |  | 118 |  | 82
Stock options |  | 385 |  | 283 |  | 346 |  | 331
Adjusted weighted-average common shares outstanding and assumed conversion |  | 60,329 |  | 62,797 |  | 61,176 |  | 63,916
Per share income from continuing operations attributable to common shares: |  |  |  |  |  |  |  |
Basic |  | $ | 1.61 |  | $ | 1.27 |  | $ | 4.40 |  | $ | 3.62
Diluted |  | $ | 1.59 |  | $ | 1.26 |  | $ | 4.37 |  | $ | 3.60
1. Basic weighted-average common shares outstanding |  | 59,826 |  | 62,432 |  | 60,712 |  | 63,503
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units |  | 60,227 |  | 62,846 |  | 61,113 |  | 63,918
Percent allocated to common shareholders |  | 99.3 | % |  | 99.3 | % |  | 99.3 | % |  | 99.4 | %
Component of income (loss) from discontinued operations and share data used in basic and diluted earnings per share | Income from discontinued operations and net income used in the basic and diluted earnings per share computations follows:
|  | Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
(in millions, except share amounts presented in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Income from discontinued operations attributable to common shareholders for basic and diluted earnings per share |  | $ | 2.8 |  | $ | 7.2 |  | $ | 251.9 |  | $ | 18.6
Net income attributable to common shareholders for basic and diluted earnings per share |  | 98.9 |  | 85.9 |  | 519.3 |  | 248.4
Anti-dilutive stock options excluded from EPS calculation1 |  | 327 |  | 377 |  | 604 |  | 328
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 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://fasb.org/us-gaap/role/ref/legacyRef -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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