Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]
Operating Lease, Right-of-Use Asset	$ 78.3	$ 71.4
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	$ 7.7	7.9
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Operating lease liabilities - current portion	$ 15.8	14.1
Operating lease liabilities - noncurrent portion	65.7	58.0
Finance lease liabilities - current portion	$ 3.2	2.6
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Debt Current Excluding Operating Lease Obligations
Finance lease liabilities - noncurrent portion	$ 4.6	$ 5.3
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term Debt, Excluding Current Maturities