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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Numerator: |  |  |  |
Income from continuing operations | $ 113.0 | $ 102.7 | $ 256.2 | $ 243.5
Less: dividends declared | (28.4) | (28.7) | (84.4) | (84.7)
Undistributed earnings | $ 84.6 | $ 74.0 | $ 171.8 | $ 158.8
Percent allocated to common shareholders | 99.70% | 99.70% | 99.70% | 99.70%
Undistributed earnings available to common shareholders | $ 84.3 | $ 73.8 | $ 171.3 | $ 158.3
Add: dividends declared to common shares, restricted share units and vested and deferred restricted and performance shares | 28.2 | 28.4 | 84.1 | 84.3
Income from continuing operations attributable to common shareholders | $ 112.5 | $ 102.2 | $ 255.4 | $ 242.6
Denominator (in thousands): |  |  |  |
Basic weighted-average shares outstanding (in shares) | 52,300,000 | 54,100,000 | 52,600,000 | 54,900,000
Effect of dilutive securities: |  |  |  |
Performance awards (in shares) | 200,000 | 200,000 | 100,000 | 200,000
Stock options (in shares) | 500,000 | 200,000 | 500,000 | 300,000
Denominator for diluted EPS: weighted-average shares outstanding (in shares) | 53,000,000.0 | 54,500,000 | 53,200,000 | 55,400,000
Per share income from continuing operations attributable to common shares: |  |  |  |
Basic (in dollars per share) | $ 2.15 | $ 1.89 | $ 4.86 | $ 4.42
Diluted (in dollars per share) | $ 2.12 | $ 1.88 | $ 4.80 | $ 4.38
Basic weighted-average shares outstanding (in shares) | 52,300,000 | 54,100,000 | 52,600,000 | 54,900,000
Basic weighted-average shares outstanding and unvested restricted shares expected to vest (in shares) | 52,400,000 | 54,300,000 | 52,700,000 | 55,100,000
Percent allocated to common shareholders | 99.70% | 99.70% | 99.70% | 99.70%
Anti-dilutive stock options excluded from EPS calculation |  |  |  |
Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share | $ 29.0 | $ (0.4) | $ 37.3 | $ (4.0)
Net income attributable to common shareholders for basic and diluted earnings per share | $ 141.5 | $ 101.8 | $ 292.7 | $ 238.6
Anti-dilutive stock options excluded from earnings per share calculation (in shares) | 0 | 400,000 | 200,000 | 300,000

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256 + Details
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