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Income Taxes - Principal Components of Deferred Tax Items (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Operating Loss Carryforwards [Line Items]    
Deferred tax assets $ 69.0 $ 65.7
Deferred tax liabilities 218.5 257.7
Other assets    
Operating Loss Carryforwards [Line Items]    
Gross deferred tax assets $ 9.0 $ 11.8