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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Earnings available to common shareholders $ 17.3 $ (2.6)    
Weighted average basic shares outstanding 182.5 148.5 182.4 148.2
Earnings per share - basic $ 0.09 $ (0.02) $ 0.16 $ (0.06)
Net Income (Loss) Available to Common Stockholders, Diluted $ 17.3 $ (2.6) $ 29.9 $ (9.2)
Dilutive impact of stock based awards 1.9 0.0 1.8 0.0
Weighted average dilutive shares outstanding 184.4 148.5 184.2 148.2
Earnings per share - diluted $ 0.09 $ (0.02) $ 0.16 $ (0.06)
Service Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 0.1   0.1 3.9
Performance Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 6.5   6.5 6.5