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Stock-Based Compensation (Stock Appreciation Rights Outstanding and Exercisable) (Details) - Stock Appreciation Rights [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 4 months 24 days |
Stock Appreciation Rights Outstanding, Shares | 1.1 | 1.1
Stock Appreciation Rights Exercisable, Shares | 0.7 |
$34.06 to $46.78 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, lower range limit | $ 34.06 |
Range of Exercise Prices per Share, upper range limit | $ 81.14 |
Stock Appreciation Rights Outstanding, Shares | 0.3 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 2 years 2 months 15 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 49.3 |
Stock Appreciation Rights Exercisable, Shares | 0.3 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 2 years 2 months 15 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 49.3 |
$51.11 to $81.14 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, lower range limit | $ 92.64 |
Range of Exercise Prices per Share, upper range limit | $ 131.94 |
Stock Appreciation Rights Outstanding, Shares | 0.3 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 4 years 6 months 7 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 31.9 |
Stock Appreciation Rights Exercisable, Shares | 0.3 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 4 years 5 months 1 day |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 27.5 |
$92.64 to $126.31 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, lower range limit | $ 156.94 |
Range of Exercise Prices per Share, upper range limit | $ 205.53 |
Stock Appreciation Rights Outstanding, Shares | 0.4 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 6 years 5 months 12 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 12.1 |
Stock Appreciation Rights Exercisable, Shares | 0.1 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 6 years |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 3.9 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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