Leases - Components of Lease Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 49.7	$ 20.4
Finance lease cost
Amortization of right-of-use assets	1.2	1.4
Interest on lease liabilities	1.1	1.6
Total finance lease cost	2.3	3.0
Short-term lease cost	$ 2.2	$ 1.7