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Equity - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     $ 134.6  
Beginning balance, shares     42,115,824  
Net income (loss) $ 35.8 $ 25.9 $ 58.8 $ 37.6
Other comprehensive income     3.8  
Common stock issued - compensation plans, value     (0.5)  
Noncontrolling interest distributions     (4.8) $ (1.7)
Stock-based compensation expense     4.9  
Repurchases of Common Stock     (0.7)  
Ending balance, shares, value $ 196.1   $ 196.1  
Ending balance, shares 42,148,524   42,148,524  
Common Stock        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     $ 0.4  
Beginning balance, shares     42,100,000  
Common stock issued - compensation plans, shares     100,000  
Ending balance, shares, value $ 0.4   $ 0.4  
Ending balance, shares 42,200,000   42,200,000  
Additional paid in capital        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     $ 129.9  
Stock-based compensation expense     4.9  
Ending balance, shares, value $ 134.8   134.8  
Retained earnings        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     16.0  
Net income (loss)     51.1  
Ending balance, shares, value 67.1   67.1  
Accumulated other comprehensive income (loss)        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     (19.0)  
Other comprehensive income     3.8  
Ending balance, shares, value (15.2)   (15.2)  
Treasury stock        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     (0.3)  
Common stock issued - compensation plans, value     (0.5)  
Repurchases of Common Stock     (0.7)  
Ending balance, shares, value (1.5)   (1.5)  
Noncontrolling interest        
Increase (Decrease) in Stockholders' Equity        
Beginning balance, value     7.6  
Net income (loss)     7.7  
Noncontrolling interest distributions     (4.8)  
Ending balance, shares, value $ 10.5   $ 10.5