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Share-based Compensation and Other Employment Benefit Plans (Stock Option) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quantity      
Outstanding at beginning of year (in shares) 3,037,000 640,000 775,000
Assumed in acquisition (in shares) 0 3,230,000 0
Options exercised (in shares) (572,000) (820,000) (126,000)
Options expired/canceled (in shares) (64,000) (13,000) (9,000)
Options outstanding at end of year (in shares) 2,401,000 3,037,000 640,000
Options exercisable at end of year (in shares) 2,401,000 2,399,000 640,000
Weighted-Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 22.74 $ 16.93 $ 17.85
Assumed in acquisition (in dollars per share) 0 23.22 0
Options exercised (in dollars per share) 22.67 19.91 16.92
Options expired (in dollars per share) 33.50 34.23 92.26
Options outstanding at end of year (in dollars per share) 22.47 22.74 16.93
Options exercisable at end of year (in dollars per share) $ 22.47 $ 19.52 $ 16.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 5.3