Leases - Supplemental Consolidated Balance Sheet information Related Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 130.8	$ 131.8
Current operating lease liabilities	25.6	30.1
Long-term operating lease liabilities	169.0	131.1
Operating lease liabilities	$ 194.6	$ 161.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Weighted average remaining lease term (years)	10 years 3 months 18 days	9 years 8 months 12 days
Weighted average discount rate	3.98%	4.78%