Leases (Lease Balances) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Leases [Abstract]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term portion, Other Accrued Liabilities, Current		Long-term portion, Other Accrued Liabilities, Current
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
ROU assets:
Operating leases	$ 728.2		$ 710.5
Finance leases	38.1		38.2
Total ROU assets	766.3		748.7
Lease liabilities:
Operating leases	774.0		753.1
Finance leases	34.1		34.1
Total lease liabilities	$ 808.1		$ 787.2
Weighted average remaining lease term for operating leases	11 years 2 months 12 days
Weighted average discount rate, for operating leases	5.40%
Addition to ROU assets associated with operating leases	$ 9.6	$ 10.5
Weighted average remaining lease term for finance leases	7 years 8 months 12 days
Weighted average discount rate, for finance leases	8.80%
ROU assets associated with finance leases	$ 0.0	$ 0.5