Leases - Lease Cash Flow and Supplemental Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 3.2	$ 3.2
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0.5	$ 2.5