Leases (Lease Balances) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization		Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent		Other Assets, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Current portion of debt and finance lease obligations (notes 9 and 10), Long-term debt and finance lease obligations		Current portion of debt and finance lease obligations (notes 9 and 10), Long-term debt and finance lease obligations
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Accrued Liabilities, Current		Other Accrued Liabilities, Current
ROU assets:
Finance leases	$ 373.0		$ 377.6
Operating leases	1,729.7		1,724.4
Total ROU assets	2,102.7		2,102.0
Lease liabilities:
Finance lease	450.8		436.1
Operating leases	1,788.8		1,791.1
Total lease liabilities	$ 2,239.6		$ 2,227.2
Weighted average remaining lease term for finance leases	21 years 6 months
Weighted average discount rate, for finance leases	6.10%
ROU assets associated with finance leases	$ 7.3	$ 8.7
Weighted average remaining lease term for operating leases	12 years 10 months 24 days
Weighted average discount rate, for operating leases	5.70%
Addition to ROU assets associated with operating leases	$ 25.0	$ 51.2