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Earnings Per Share Earnings Per Share (Details) - $ / shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Document Period End Date     Sep. 30, 2018  
Basic weighted average shares outstanding 78.8 82.6 80.1 84.1
Basic $ 2.71 $ 2.96 $ 1.90 $ 1.68
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.5 0.7 0.2 0.8