Leases - Cash flow information, weighted average remaining term and discount rate (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 124.6	$ 114.3
Right-of-use assets obtained in exchange for operating lease liabilities	$ 64.2	$ 2.6
Weighted-average remaining lease term - operating leases	24 years		25 years
Weighted-average discount rate - operating leases	6.20%		6.40%