Leases - Components of Lease Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease Cost
Interest expense on lease liabilities	$ 0.2
Amortization of right-of-use assets	0.4
Operating lease cost	6.2
Short-term lease expense	0.3
Variable lease expense	0.0
Sublease income	0.0
Total Lease Cost	$ 7.1