Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease expense	$ 4.3	$ 3.6
Variable lease expense	0.6	0.6
Short-term lease expense	0.9	0.7
Total lease expense	$ 5.8	$ 4.9