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Income Taxes Uncertain Tax Provisions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in unrecognized tax benefits for all jurisdictions were as follows: |  |  |
Gross unrecognized tax benefits, beginning of period | $ 25.2 | $ 124.6 | $ 36.9
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0.9 | 0.7 | 84.7
Current year tax positions | 3.0 | 3.0 | 3.0
Prior year tax positions - decreases | (3.8) | (99.7) | 0.0
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation | 0.5 |  | 0.0
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation |  | (3.4) |
Gross unrecognized tax benefits, end of period | 25.8 | 25.2 | $ 124.6
Income Tax Contingency [Line Items] |  |  |
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods | 22.6 |  |
Accrued interest and penalties related to unrecognized tax benefits, which are reflected in other noncurrent liabilities | 6.4 | $ 5.0 |
Non-US |  |  |
Income Tax Contingency [Line Items] |  |  |
Prior year tax positions - increases | 0.5 |  |
US and non-US [Domain] |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits That Impacted Effective Tax Rate | $ 3.0 |  |

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