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Share-Based Compensation Plans - Relative Total Shareholder Return Performance Unit Activity (Details) - RTSR - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance (in shares) 39 0  
Granted (in shares) 38 39  
Ending balance (in shares) 62 39 0
Nonvested shares outstanding (in shares) $ 78.35 $ 64.82 $ 0
Granted, weighted average grant date fair value (in dollars per share) $ 101.13 $ 64.82  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (15)    
Weighted- Average Remaining Term in Years [1] 1 year 8 months 12 days 2 years  
Aggregate Intrinsic Value $ 2.4 $ 3.4  
Forfeited (in dollars per share) $ 101.13    
[1] * Midpoint used in calculation.