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Summary of Significant Accounting Policies (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Additional paid-in capital | $ 2,995.7 |  | $ 2,995.7 |  | $ 3,051.6
Long-term debt, net | 1,067.4 |  | 1,067.4 |  | 1,025.3
Deferred taxes, net | (119.3) |  | (119.3) |  | (163.6)
Retained earnings | 886.7 |  | 886.7 |  | 682.2
Interest expense | $ 1.6 | $ 0.0 | $ 3.2 | $ 0.0 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Additional paid-in capital |  |  |  |  | 57.1
Long-term debt, net |  |  |  |  | 57.9
Deferred taxes, net |  |  |  |  | 13.2
Retained earnings |  |  |  |  | $ 12.4
Common stock, shares, outstanding (in shares) |  |  |  |  | 14.7

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