Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Operating lease right of use asset	$ 67.4	$ 65.6
Other current liabilities	21.3	20.6
Operating lease liability - long term	$ 47.0	$ 47.0
Weighted average remaining lease term	5 years 2 months 12 days	5 years
Weighted average discount rate	1.90%	2.30%
Finance Leases
Property, plant and equipment, net	$ 3.7	$ 1.7
Current portion of long-term debt	0.8	0.4
Long-term debt	$ 2.6	$ 1.1
Weighted average remaining lease term	3 years 3 months 18 days	3 years 8 months 12 days
Weighted average discount rate	2.20%	3.00%