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Recent Accounting Pronouncements (Impact of Adoption of ASU 2016-02) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets:      
Property, plant and equipment, net $ 260.3 $ 262.8 $ 263.7
Right of use asset, leases 83.6 90.9 0.0
Liabilities and stockholders' equity:      
Current portion of long-term debt 47.1 39.4 39.5
Lease liabilities 22.8 24.1 0.0
Long-term debt, net 949.4 842.9 843.0
Long-term lease liabilities 69.7 76.6 11.0
Accumulated deficit (663.0) (656.3) $ (656.8)
Accounting Standards Update 2016-02      
Assets:      
Property, plant and equipment, net   (0.9)  
Right of use asset, leases   90.9  
Liabilities and stockholders' equity:      
Current portion of long-term debt   (0.1)  
Lease liabilities   24.1  
Long-term debt, net   (0.1)  
Long-term lease liabilities   65.6  
Accumulated deficit   $ 0.5  
Balances without adoption of ASU 2016-02      
Assets:      
Property, plant and equipment, net 261.1    
Right of use asset, leases 0.0    
Liabilities and stockholders' equity:      
Current portion of long-term debt 47.2    
Lease liabilities 0.0    
Long-term debt, net 949.5    
Long-term lease liabilities 10.0    
Accumulated deficit (663.5)    
Effect of Change Higher/(Lower) | Accounting Standards Update 2016-02      
Assets:      
Property, plant and equipment, net (0.8)    
Right of use asset, leases 83.6    
Liabilities and stockholders' equity:      
Current portion of long-term debt (0.1)    
Lease liabilities 22.8    
Long-term debt, net (0.1)    
Long-term lease liabilities 59.7    
Accumulated deficit $ 0.5