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Share-based Compensation Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-settled awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 0.8 | 1.1 | 0.8
Weighted-average grant-date fair value (per award) | $ 24.18 | $ 21.87 | $ 22.07
Total fair value of vested awards distributed | $ 22.6 | $ 17.5 | $ 18.8
Accrued dividends on non-vested stock-settled awards | 1.5 | 1.3 |
Dividends paid for stock-settled awards | $ 1.2 | $ 0.6 |
Cash-settled awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 0.0 | 0.1 | 0.1
Weighted-average grant-date fair value (per award) | $ 23.33 | $ 22.54 | $ 20.46
Total fair value of vested awards distributed | $ 0.9 | $ 0.7 | $ 0.2
Performance-based awards |  |  |
Stock-based Payment Award |  |  |
Awards granted | 4.8 | 3.3 | 2.9
Weighted-average grant-date fair value (per award) | $ 20.06 | $ 19.58 | $ 20.88
Total fair value of vested awards distributed | $ 112.4 | $ 27.9 | $ 18.7

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- Definition Stock based awards expected to be settled in cash + References No definition available. + Details
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- Definition Amount of paid and unpaid stock dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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