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Stock-based Compensation - PRSU And RSU Activity And Related Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Performance-based Restricted Stock Units    
Shares    
Beginning balance (in shares) 2.0 2.7
Granted (in shares) 0.1 0.2
Vested (in shares) 0.0 (0.1)
Forfeited/Terminated (in shares) (1.3) (0.8)
Ending balance (in shares) 0.8 2.0
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 61.07 $ 64.13
Granted (in dollars per share) 85.41 51.72
Vested (in dollars per share) 59.21 68.57
Forfeited/Terminated (in dollars per share) 70.94 68.07
Ending balance (in dollars per share) $ 60.09 $ 61.07
Restricted Stock Units and Deferred Stock Units    
Shares    
Beginning balance (in shares) 0.8 0.6
Granted (in shares) 0.7 0.3
Vested (in shares) (0.3) (0.1)
Forfeited/Terminated (in shares) 0.0 0.0
Ending balance (in shares) 1.2 0.8
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 63.82 $ 64.94
Granted (in dollars per share) 43.07 61.29
Vested (in dollars per share) 62.54 62.85
Forfeited/Terminated (in dollars per share) 58.07 64.00
Ending balance (in dollars per share) $ 52.96 $ 63.82
Intrinsic value $ 110.5 $ 34.6