Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Operating Leases
Operating lease ROU assets		$ 360.4	$ 400.7
Operating lease liabilities - current	[1]	108.0	119.3
Operating lease liabilities - long-term		268.5	305.1
Total operating lease liabilities		$ 376.5	$ 424.4

[1] Operating lease liabilities - current are included in accrued expenses on our Consolidated Balance Sheets.