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Fair Value Information (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Assets        
Cash, cash equivalents and restricted cash $ 531.1 $ 219.7 $ 154.8 $ 113.7
Liabilities        
Debt 250.0 589.0    
Level 1 | Carrying Amount        
Assets        
Cash, cash equivalents and restricted cash 531.1 219.7    
Liabilities        
Debt 247.4 247.1    
Level 1 | Estimated Fair Value        
Assets        
Cash, cash equivalents and restricted cash 531.1 219.7    
Liabilities        
Debt 256.6 259.7    
Level 2 | Carrying Amount        
Liabilities        
Debt 0.0 333.8    
Level 2 | Estimated Fair Value        
Liabilities        
Debt $ 0.0 $ 341.1