Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Lease Assets
Operating ROU assets	$ 176.2	$ 163.9
Finance lease assets	6.5	6.7
Total lease assets	$ 182.7	$ 170.6
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	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
Current:
Operating	$ 45.4	$ 42.2
Finance	$ 0.5	$ 0.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current	Accrued Liabilities, Current
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Noncurrent:
Operating	$ 134.4	$ 125.4
Finance	$ 5.4	$ 5.4
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities	Other noncurrent liabilities
Total lease liabilities	$ 185.7	$ 173.7
Finance lease asset, accumulated depreciation	$ 3.1	$ 5.1