Leases - Lease Expense and Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease costs	$ 54.9	$ 50.8
Finance lease costs:
Amortization of leased assets	19.0	15.3
Interest on lease liabilities	15.7	10.9
Total finance lease costs	34.7	26.2
Variable and short-term lease costs	12.6	10.6
Total lease costs	102.2	87.6
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	49.8	48.7
Operating cash outflows from finance leases	15.7	10.9
Financing cash outflows from finance leases	12.9	9.4
Right-of-use assets obtained in exchange for operating lease obligations	53.9	48.0
Right-of-use assets obtained in exchange for finance lease obligations	$ 11.5	$ 9.1