Leases - Components of Right-of-Use Assets (Details) $ in Millions	Sep. 30, 2019 USD ($)
Finance
Gross property, plant and equipment	$ 3.5
Less: Accumulated depreciation	(0.6)
Right-of-use assets	2.9
Operating
Gross property, plant and equipment	26.4
Less: Accumulated depreciation	(4.4)
Right-of-use assets	22.0
Total
Gross property, plant and equipment	29.9
Less: Accumulated depreciation	(5.0)
Right-of-use assets	24.9
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	2.9
Operating
Gross property, plant and equipment	21.7
Total
Gross property, plant and equipment	24.6
Machinery and equipment
Finance
Gross property, plant and equipment	0.6
Operating
Gross property, plant and equipment	4.6
Total
Gross property, plant and equipment	$ 5.2