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	$ 41.6
Operating cash flows from finance leases	4.8
Financing cash flows from finance leases	3.8
ROU assets obtained in exchange for lease obligations:
Operating leases, initial recognition	34.0
Operating leases, modifications and remeasurements	(9.1)
Finance leases, initial recognition	29.6
Finance leases, modifications and remeasurements	$ 8.2