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Share-based Compensation Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based Payment Award |  |  |
Vesting period in which the fair value of shares on grant date is amortized over, years | two years |  |
Stock-settled awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 2.3 | 2.5 | 2.1
Weighted-average grant-date fair value (per award) | $ 20.70 | $ 22.78 | $ 23.60
Total fair value of vested awards distributed | $ 17.3 | $ 15.2 | $ 24.2
Accrued dividends on non-vested stock-settled awards | 5.6 | 4.2 |
Dividends paid for stock-settled awards | $ 1.5 | $ 1.2 |
Cash-settled awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 0.0 | 0.0 | 0.1
Weighted-average grant-date fair value (per award) | $ 21.02 | $ 22.83 | $ 23.62
Total fair value of vested awards distributed | $ 0.3 | $ 0.9 | $ 0.8
Performance-based awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 2.4 | 2.1 | 2.9
Weighted-average grant-date fair value (per award) | $ 18.67 | $ 20.16 | $ 21.13
Total fair value of vested awards distributed | $ 53.3 | $ 64.9 | $ 87.2

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- Definition Dividends paid for stock-settled awards vested during the period. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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