Leases (Lease Balances) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
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
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Current portion of debt and finance lease obligations (notes 8 and 9), Long-term debt and finance lease obligations		Current portion of debt and finance lease obligations (notes 8 and 9), 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	$ 56.1		$ 57.9
Operating leases	2,225.6		1,761.8
Total ROU assets	2,281.7		1,819.7
Lease liabilities:
Finance lease	52.3		58.0
Operating leases	2,060.9		1,803.9
Total lease liabilities	$ 2,113.2		$ 1,861.9
Weighted average remaining lease term for finance leases	10 years 7 months 6 days
Weighted average discount rate, for finance leases	4.90%
ROU assets associated with finance leases	$ 0.5	$ 7.3
Weighted average remaining lease term for operating leases	9 years 10 months 24 days
Weighted average discount rate, for operating leases	4.80%
Addition to ROU assets associated with operating leases	$ 29.4	$ 25.0