Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | ||||
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Jun. 30, 2022 |
Mar. 31, 2022 |
Jun. 30, 2021 |
Mar. 31, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
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| Earnings Per Share [Abstract] | ||||||
| Net income | $ 145.2 | $ 220.3 | $ 139.3 | $ 199.7 | $ 365.5 | $ 339.0 |
| Net income attributable to unvested awarded performance stock | (2.7) | (3.0) | (7.1) | (7.9) | ||
| Net income attributable to common shares | $ 142.5 | $ 136.3 | $ 358.4 | $ 331.1 | ||
| Weighted average number of common shares outstanding – basic | 282.5 | 281.8 | 282.6 | 282.2 | ||
| Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (5.3) | (6.1) | (5.5) | (6.6) | ||
| Weighted average number of common shares outstanding for basic net income per common share | 277.2 | 275.7 | 277.1 | 275.6 | ||
| Dilutive effect of potentially issuable common shares | 1.0 | 1.2 | 1.3 | 1.3 | ||
| Weighted average number of shares outstanding – diluted | 278.2 | 276.9 | 278.4 | 276.9 | ||
| Basic (in dollars per share) | $ 0.51 | $ 0.49 | $ 1.29 | $ 1.20 | ||
| Diluted (in dollars per share) | $ 0.51 | $ 0.49 | $ 1.29 | $ 1.20 | ||
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- Definition Net income attributable to unvested awarded performance stock No definition available.
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- Definition Weighted average number of shares unvested share awards not committed to be released. No definition available.
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- References No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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