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Stock-Based Compensation (Stock Appreciation Rights Outstanding and Exercisable) (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 3 months 18 days  
Stock Appreciation Rights Outstanding, Shares 0.8 0.9
Stock Appreciation Rights Exercisable, Shares 0.5  
$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 $ 81.11  
Range of Exercise Prices per Share, upper range limit $ 131.94  
Stock Appreciation Rights Outstanding, Shares 0.2  
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) 2 years 3 months 7 days  
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value $ 28.3  
Stock Appreciation Rights Exercisable, Shares 0.2  
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) 1 year 9 months  
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value $ 28.3  
$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 $ 156.94  
Range of Exercise Prices per Share, upper range limit $ 205.53  
Stock Appreciation Rights Outstanding, Shares 0.3  
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) 4 years 5 months 26 days  
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value $ 19.3  
Stock Appreciation Rights Exercisable, Shares 0.3  
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) 4 years 4 months 20 days  
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value $ 17.4  
$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 $ 214.63  
Range of Exercise Prices per Share, upper range limit $ 257.08  
Stock Appreciation Rights Outstanding, Shares 0.3  
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) 6 years 5 months 26 days  
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value $ 4.2  
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 $ 1.4