Leases - Supplemental cash flow information related to leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 64.7
Operating cash flows from finance leases	7.8
Financing cash flows from finance leases	4.2
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	73.1
Finance leases	$ 15.5