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Stock-Based Compensation - Restricted Stock (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock expense $ 27.0 $ 26.7 $ 28.0
Restricted stock expense, net of tax $ 19.7 $ 19.5 $ 20.4
Status of nonvested restricted stock [Roll Forward]      
Nonvested shares, number, beginning balance 1,429,000 1,326,000 1,266,000
Nonvested shares, weighted average price, beginning balance $ 44.12 $ 53.18 $ 43.57
Nonvested shares, granted 804,000 724,000 687,000
Nonvested shares, weighted average price, granted $ 40.10 $ 30.07 $ 58.45
Nonvested shares, vested (521,000) (551,000) (588,000)
Nonvested shares, weighted average price, vested $ 56.53 $ 47.55 $ 39.14
Nonvested shares, forfeited (119,000) (70,000) (39,000)
Nonvested shares, weighted average price, forfeited $ 38.97 $ 43.05 $ 50.85
Nonvested shares, number, ending balance 1,593,000 1,429,000 1,326,000
Nonvested shares, weighted average price, ending balance $ 38.86 $ 44.12 $ 53.18
Restricted stock unrecognized compensation, amount $ 28.0    
Restricted stock unrecognized compensation, period 2 years    
Management [Member]      
Status of nonvested restricted stock [Roll Forward]      
Nonvested shares, granted 776,753    
Director [Member]      
Status of nonvested restricted stock [Roll Forward]      
Nonvested shares, granted 26,919