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Stock-Based Compensation (Intrinsic Value and Tax Deductions of Stock Appreciation Rights) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Realized tax benefits from tax deductions | $ 23.6 | $ 0.0 | $ 0.0
Stock Appreciation Rights [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeiture Rate | 14.20% |  |
Instrinsic value of stock appreciation rights exercised | $ 25.1 | 36.9 | 27.3
Realized tax benefits from tax deductions | $ 9.6 | $ 14.1 | $ 10.4

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Forfeiture Rate. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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