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Leases - Components of Right-of-Use Assets (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Finance  
Gross property, plant and equipment $ 3.2
Less: Accumulated depreciation (0.4)
Property, plant and equipment, net 2.8
Operating  
Gross property, plant and equipment 26.2
Less: Accumulated depreciation (2.1)
Property, plant and equipment, net 24.1
Total  
Gross property, plant and equipment 29.4
Less: Accumulated depreciation (2.5)
Property, plant and equipment, net 26.9
Land and improvements  
Finance  
Gross property, plant and equipment 0.0
Operating  
Gross property, plant and equipment 0.1
Total  
Gross property, plant and equipment 0.1
Buildings and improvements  
Finance  
Gross property, plant and equipment 3.0
Operating  
Gross property, plant and equipment 21.7
Total  
Gross property, plant and equipment 24.7
Machinery and equipment  
Finance  
Gross property, plant and equipment 0.2
Operating  
Gross property, plant and equipment 4.4
Total  
Gross property, plant and equipment $ 4.6