Leases (Maturities of Operating and Financing Lease Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Operating leases
2021 (remainder of year)	$ 53.5
2022	204.9
2023	188.8
2024	173.5
2025	159.7
2026	47.6
Thereafter	1,120.9
Total payments	1,948.9
Less: present value discount	(625.3)
Present value of lease payments	1,323.6	$ 1,432.0
Current portion	183.3
Noncurrent portion	1,140.3	1,255.4
Finance leases
2021 (remainder of year)	25.4
2022	94.6
2023	98.2
2024	61.1
2025	57.7
2026	53.7
Thereafter	244.5
Total payments	635.2
Less: present value discount	(142.0)
Present value of lease payments	493.2	$ 549.5
Current portion	67.9
Noncurrent portion	$ 425.3