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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Schedule of 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 and percentages) |  | 2022 |  | 2021 |  | 2020
Income from continuing operations |  | $ | 925.2 |  |  | $ | 387.0 |  |  | $ | 325.7 |
Less: dividends declared |  | 134.6 |  |  | 112.7 |  |  | 112.7 |
Undistributed earnings |  | 790.6 |  |  | 274.3 |  |  | 213.0 |
Percent allocated to common stockholders(1) |  | 99.8 | % |  | 99.7 | % |  | 99.7 | %
Undistributed earnings allocated to common stockholders |  | 788.8 |  |  | 273.5 |  |  | 212.4 |
Add: dividends declared to common shares, restricted share units and vested and deferred restricted and performance shares |  | 134.2 |  |  | 112.4 |  |  | 112.2 |
Income from continuing operations attributable to common stockholders |  | $ | 923.0 |  |  | $ | 385.9 |  |  | $ | 324.6 |
Shares: |  |  |  |  |  |
Basic weighted-average shares outstanding |  | 51.8 |  |  | 52.5 |  |  | 54.5 |
Effect of dilutive securities: |  |  |  |  |  |
Performance awards |  | 0.2 |  |  | 0.2 |  |  | 0.3 |
Stock options |  | 0.5 |  |  | 0.5 |  |  | 0.2 |
Diluted weighted-average shares outstanding |  | 52.5 |  |  | 53.2 |  |  | 55.0 |
Per share income from continuing operations attributable to common shares: |  |  |  |  |  |
Basic |  | $ | 17.82 |  |  | $ | 7.35 |  |  | $ | 5.95 |
Diluted |  | $ | 17.58 |  |  | $ | 7.26 |  |  | $ | 5.90 |
(1) | Basic weighted-average shares outstanding |  | 51.8 |  |  | 52.5 |  |  | 54.5 |
| Basic weighted-average shares outstanding and unvested restricted shares expected to vest |  | 51.9 |  |  | 52.6 |  |  | 54.7 |
| Percent allocated to common stockholders |  | 99.8 | % |  | 99.7 | % |  | 99.7 | %
Schedule of Antidilutive Securities Excluded from Computation of 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) |  | 2022 |  | 2021 |  | 2020
(Loss) income from discontinued operations attributable to common stockholders for basic and dilutive earnings per share |  | $ | (1.2) |  |  | $ | 34.6 |  |  | $ | (5.6) |
Net income attributable to common stockholders for basic and diluted earnings per share |  | $ | 921.8 |  |  | $ | 420.5 |  |  | $ | 319.0 |
Anti-dilutive stock options excluded from earnings per share calculation (1) |  | 0.2 |  |  | 0.1 |  |  | 0.3 |
(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 securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + 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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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