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Earnings Per Share Earnings Per Share (Details) - $ / shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Document Period End Date Mar. 31, 2018  
Basic and diluted weighted average shares outstanding (a) 81.0 85.7
Basic $ (1.08) $ (1.25)
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
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 1.5 2.6