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Property, Plant and Equipment, net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Property, plant and equipment, net          
Document Period End Date     Sep. 30, 2016    
Gross property, plant and equipment $ 591.6   $ 591.6   $ 572.5
Less: Accumulated depreciation and amortization 290.7   290.7   265.5
Net property, plant and equipment 300.9   300.9   307.0
Loss on disposal of property, plant and equipment 0.1 $ 0.5 0.1 $ 1.7  
Net capitalized turnaround costs:          
Beginning balance     37.8 16.7  
Additions     3.5 33.1  
Depreciation     (11.6) (8.5)  
Ending balance 29.7 $ 41.3 29.7 $ 41.3  
Land          
Property, plant and equipment, net          
Gross property, plant and equipment 1.6   1.6   1.6
Buildings and improvements          
Property, plant and equipment, net          
Gross property, plant and equipment 16.6   16.6   14.5
Machinery and equipment          
Property, plant and equipment, net          
Gross property, plant and equipment 555.9   555.9   537.5
Construction in progress          
Property, plant and equipment, net          
Gross property, plant and equipment $ 17.5   $ 17.5   $ 18.9