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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

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