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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, 2018 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 | $ | $ 9.7
Shares |
Outstanding awards as of beginning of period (in shares) | shares | 1.1
Granted (in shares) | shares | 0.2
Exercised (in shares) | shares | (0.3)
Forfeited (in shares) | shares | 0.0
Outstanding awards as of end of period (in shares) | shares | 0.9
Exercisable at end of period (in shares) | shares | 0.6
Weighted-Average Exercise Price per Share |
Outstanding awards as of beginning of period (in usd per share) | $ / shares | $ 121.63
Granted (in usd per share) | $ / shares | 214.63
Exercised (in usd per share) | $ / shares | 74.51
Forfeited (in usd per share) | $ / shares | 0.00
Outstanding as of end of period (in shares) | $ / shares | 148.98
Exercisable at end of period, Weighted-Average Exercise Price per Share (in usd per share) | $ / shares | $ 120.52

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