Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Operating lease ROU assets	$ 400.7	$ 448.5
Operating lease liabilities - current	$ 119.3	$ 122.1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesMember	us-gaap:AccruedLiabilitiesMember
Operating lease liabilities - long-term	$ 305.1	$ 336.7
Total operating lease liabilities	$ 424.4	$ 458.8