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Earnings Per Share Earnings Per Share (Details) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Document Period End Date     Jun. 30, 2018  
Basic weighted average shares outstanding 80.7 84.0 80.8 84.9
Basic $ 0.33 $ 0.04 $ (0.75) $ (1.22)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     0.1 0.8
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 0.2 0.7 1.5 1.3