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Share-Based and Other Compensation - 2018 Special Market-Based RSU Grant (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 27, 2018
Dec. 31, 2018
Dec. 31, 2018
December 2018 Market-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares)   346,777  
Award vesting period   3 years  
Vesting criteria, one   75.00% 75.00%
Vesting criteria, two   25.00% 25.00%
Fair value RSUs granted $ 23.8    
Fair value per share on valuation date (in dollars per share) $ 68.66   $ 68.66
Expected share price volatility (in dollars per share) 23.00%    
Risk-free interest rate 2.40%    
December 2018 Market-Based RSUs, TSR [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   4 years  
Minimum [Member] | December 2018 Market-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target percent   0.00%  
Maximum [Member] | December 2018 Market-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target percent   200.00%