Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease Cost
Interest expense on lease liabilities	$ 0.0	$ 0.1
Amortization of right-of-use assets	0.1	0.3
Operating Lease, Cost	1.6	4.7
Short-term Lease, Cost	0.0	0.2
Lease, Cost	$ 1.7	$ 5.3