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Leases - Components of Right-of-Use Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finance    
Gross property ,plant and equipment $ 4.2 $ 3.6
Less: Accumulated depreciation (1.2) (0.7)
Right-of-use assets 3.0 2.9
Operating    
Gross property, plant and equipment 30.3 26.4
Less: Accumulated depreciation (10.5) (5.5)
Right-of-use assets 19.8 20.9
Total    
Gross property, plant and equipment 34.5 30.0
Less: Accumulated depreciation (11.7) (6.2)
Right-of-use assets 22.8 23.8
Land and improvements    
Finance    
Gross property ,plant and equipment 0.0 0.0
Operating    
Gross property, plant and equipment 0.1 0.1
Total    
Gross property, plant and equipment 0.1 0.1
Buildings and improvements    
Finance    
Gross property ,plant and equipment 3.1 2.9
Operating    
Gross property, plant and equipment 25.9 21.8
Total    
Gross property, plant and equipment 29.0 24.7
Machinery and equipment    
Finance    
Gross property ,plant and equipment 1.1 0.7
Operating    
Gross property, plant and equipment 4.3 4.5
Total    
Gross property, plant and equipment $ 5.4 $ 5.2