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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]    
Operating ROU assets, extensible list Deferred charges and other assets Deferred charges and other assets
Operating lease liability, current, extensible list Accrued liabilities Accrued liabilities
Operating lease liability, noncurrent, extensible list Other deferred credits and liabilities Other deferred credits and liabilities
Operating ROU assets $ 11.3 $ 12.9
Current operating lease liabilities 2.0 1.9
Noncurrent operating lease liabilities 8.5 9.8
Total operating lease liabilities $ 10.5 $ 11.7