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Loss 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
Numerator        
Net loss $ (7.7) $ (45.1) $ (3.9) $ (80.3)
Denominator        
Basic weighted average number of common shares outstanding for all classes of common shares (in shares) 47.4 47.9 47.5 47.8
Plus: effect of dilutive equity incentive instruments (in shares) 0.0 0.0 0.0 0.0
Diluted weighted average number of common shares outstanding for all classes of common shares (in shares) 47.4 47.9 47.5 47.8
Loss per share        
Basic and diluted (in dollars per share) $ (0.16) $ (0.94) $ (0.08) $ (1.68)
Cash dividends paid per common share for all classes of common shares (in dollars per share) $ 0.30 $ 0.30 $ 0.60 $ 0.60