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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