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Significant Accounting Policies - Impact on Financial Statements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities |  |
Accrued income taxes | $ 16.1 | $ 46.5
Current convertible notes | 255.9 | 220.9
Long-term deferred tax liabilities | 59.8 | 60.2
Equity |  |
Additional paid-in capital | 779.0 | 780.8
Retained earnings | $ 878.2 | 808.4
Cumulative Effect, Period of Adoption, Adjustment |  |
Liabilities |  |
Accrued income taxes |  | (0.2)
Current convertible notes |  | 34.0
Long-term deferred tax liabilities |  | (7.6)
Equity |  |
Additional paid-in capital |  | (36.9)
Retained earnings |  | 10.7
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Liabilities |  |
Accrued income taxes |  | 46.3
Current convertible notes |  | 254.9
Long-term deferred tax liabilities |  | 52.6
Equity |  |
Additional paid-in capital |  | 743.9
Retained earnings |  | $ 819.1

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