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Income Taxes (Deferred Tax Assets (Liabilities) Classification) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Deferred tax asset $ 121.4 $ 135.8
Deferred tax liabilities:    
Long-term income taxes (2.5) (2.0)
Net deferred tax assets 118.9 133.8
Other Assets    
Deferred tax assets:    
Deferred tax asset 121.4 135.8
Long Term Income Taxes    
Deferred tax liabilities:    
Long-term income taxes $ (2.5) $ (2.0)