Leases -Supplemental Cash Flow Information (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 finance leases	$ 1.7
Financing cash flows from finance leases	9.8
Operating cash flows from operating leases	25.8
Right-of-use assets obtained in exchange for new lease liabilities
Finance leases	2.1
Operating leases	$ 90.1