Leases - Supplemental Balance Sheet Lease Information (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 137.6	$ 154.5
Current operating lease liabilities	47.1	46.6
Non-current operating lease liabilities	104.7	119.5
Total operating lease liabilities	151.8	166.1
Finance lease right-of-use assets	62.1	73.0
Current finance lease liabilities	7.7	34.5
Non-current finance lease liabilities	57.1	60.0
Total finance lease liabilities	$ 64.8	$ 94.5