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Leases (Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Lease Assets    
Operating ROU assets $ 154.1 $ 165.1
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Finance lease assets $ 10.6 $ 15.1
Total lease assets $ 164.7 $ 180.2
Current:    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities, Current Accrued Liabilities, Current
Operating $ 42.3 $ 43.5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Finance $ 3.8 $ 3.0
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities Other noncurrent liabilities
Noncurrent:    
Operating $ 115.5 $ 125.9
Finance 6.0 9.8
Total lease liabilities 167.6 182.2
Finance lease asset, accumulated depreciation $ 7.8 $ 15.6