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Income Taxes - Principal Components of Deferred Tax Items (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Operating Loss Carryforwards [Line Items]    
Deferred tax assets $ 65.7 $ 82.0
Deferred tax liabilities 257.7 255.8
Other assets    
Operating Loss Carryforwards [Line Items]    
Gross deferred tax assets $ 11.8 $ 15.1