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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
Dec. 27, 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 (percent)   75.00%
Vesting criteria, two (percent)   25.00%
Fair value RSUs granted $ 23.8  
Fair value per share on valuation date (in dollars per share) $ 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%