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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Component of income from continuing operations and share data used in basic and diluted earnings per share | Income from continuing operations and share data used in the basic and diluted earnings per share computations using the two-class method follows:
(in millions except per share amounts) |  | 2020 |  | 2019 |  | 2018
Income from continuing operations |  | $ | 324.2 |  |  | $ | 473.7 |  |  | $ | 358.6 |
Less: dividends declared |  | (112.7) |  |  | (102.9) |  |  | (93.5) |
Undistributed earnings |  | 211.5 |  |  | 370.8 |  |  | 265.1 |
Percent allocated to common shareholders (1) |  | 99.7 | % |  | 99.7 | % |  | 99.7 | %
|  | 210.9 |  |  | 369.7 |  |  | 264.3 |
Add: dividends declared to common shares, restricted share units and vested and deferred restricted and performance shares |  | 112.2 |  |  | 102.7 |  |  | 93.1 |
Income from continuing operations attributable to common shareholders |  | $ | 323.1 |  |  | $ | 472.4 |  |  | $ | 357.4 |
Shares: |  |  |  |  |  |
Basic weighted-average shares outstanding |  | 54.5 |  |  | 56.9 |  |  | 60.4 |
Effect of dilutive securities: |  |  |  |  |  |
Performance awards |  | 0.3 |  |  | 0.2 |  |  | 0.1 |
Stock options |  | 0.2 |  |  | 0.4 |  |  | 0.3 |
Diluted weighted-average shares outstanding |  | 55.0 |  |  | 57.5 |  |  | 60.8 |
Per share income from continuing operations attributable to common shares: |  |  |  |  |  |
Basic |  | $ | 5.93 |  |  | $ | 8.30 |  |  | $ | 5.92 |
Diluted |  | $ | 5.88 |  |  | $ | 8.21 |  |  | $ | 5.88 |
(1) Basic weighted-average shares outstanding |  | 54.5 |  |  | 56.9 |  |  | 60.4 |
Basic weighted-average shares outstanding and unvested restricted shares expected to vest |  | 54.7 |  |  | 57.1 |  |  | 60.6 |
Percent allocated to common shareholders |  | 99.7 | % |  | 99.7 | % |  | 99.7 | %
Component of income (loss) from discontinued operations and share data used in basic and diluted earnings per share | To calculate earnings per share for income from discontinued operations and for net income, the denominator for both basic and diluted earnings per share is the same as used in the above table.
(in millions) |  | 2020 |  | 2019 |  | 2018
(Loss) income from discontinued operations attributable to common shareholders for basic and dilutive earnings per share |  | $ | (4.1) |  |  | $ | (0.9) |  |  | $ | 251.8 |
Net income attributable to common shareholders for basic and diluted earnings per share |  | 319.0 |  |  | 471.5 |  |  | 609.2 |
Anti-dilutive stock options excluded from EPS calculation (1) |  | 0.3 |  |  | — |  |  | 0.8 |
(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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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