Leases (Leased Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating right-of-use lease assets	$ 255.3	$ 218.8
Finance lease assets	291.7	227.7
Total leased assets	547.0	446.5
Current
Operating	38.2	33.5
Finance	8.2	5.8
Long-term
Operating	239.0	206.6
Finance	241.2	200.7
Total lease liabilities	$ 526.6	$ 446.6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Long-term Debt and Lease Obligation, Current	Long-term Debt and Lease Obligation, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term portion	Long-term portion