Leases - Supplemental balance sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease assets	$ 299.1	$ 322.0
Finance lease assets	$ 206.5	$ 169.5
Finance lease, right-of-use asset, statement of financial position [extensible enumeration]	Property and equipment, net	Property and equipment, net
Total lease assets	$ 505.6	$ 491.5
Current liabilities operating leases	$ 77.3	$ 77.2
Operating lease, liability, current, statement of financial position [extensible enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Current liabilities financing leases	$ 43.0	$ 37.5
Finance lease, liability, current, statement of financial position [extensible enumeration]	Current maturities of long-term debt	Current maturities of long-term debt
Lease liabilities	$ 241.8	$ 267.2
Finance lease, liability, noncurrent, statement of financial position [extensible enumeration]	Long-term debt	Long-term debt
Noncurrent liabilities financing leases	$ 135.5	$ 113.9
Total lease liabilities	$ 497.6	$ 495.8