Leases - Cash Flow Classifications (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows for operating leases	$ 43.9
Operating cash flows for finance leases	0.6
Financing cash flows for finance leases	3.0
Leased assets obtained in exchange for new finance lease liabilities	20.2
Leased assets obtained in exchange for new operating lease liabilities	$ 10.3