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Stock-Based Compensation (Changes in Stock Appreciation Rights) (Details) - Stock Appreciation Rights [Member] $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ | $ 9.0
Shares (2) |
Outstanding awards as of beginning of period (in shares) | shares | 1.3
Granted (in shares) | shares | 0.2
Exercised (in shares) | shares | (0.4)
Forfeited (in shares) | shares | 0.0
Outstanding awards as of end of period (in shares) | shares | 1.1
Exercisable at end of period (in shares) | shares | 0.7
Weighted-Average Exercise Price per Share |
Outstanding awards as of beginning of period (in usd per share) | $ / shares | $ 72.54
Granted (in usd per share) | $ / shares | 156.94
Exercised (in usd per share) | $ / shares | 47.34
Forfeited (in usd per share) | $ / shares | 0.00
Outstanding as of end of period (in shares) | $ / shares | 98.35
Exercisable at end of period, Weighted-Average Exercise Price per Share (in usd per share) | $ / shares | $ 72.17

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=6415400&loc=d3e5070-113901 + Details
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