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Significant Accounting Policies - Impact on Financial Statements (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liabilities |  |  |  |
Accrued income taxes | $ 3.5 | $ 16.1 |  | $ 46.5
Current convertible notes | 256.9 | 255.9 |  | 220.9
Long-term deferred tax liabilities | 46.1 | 59.8 |  | 60.2
Equity |  |  |  |
Additional paid-in capital | 1,850.2 | 779.0 |  | 780.8
Retained earnings | 902.2 | 878.2 |  | 808.4
Unamortized discount | 29.9 | 0.0 |  |
Unamortized debt issuance costs | 4.8 | 0.0 |  |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |
Equity |  |  |  |
Unamortized discount |  |  |  | 34.8
Unamortized debt issuance costs | $ 1.9 | $ 2.9 | $ 3.9 | 3.1
Cumulative effect of accounting change |  |  |  |
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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