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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of unrecognized tax benefits [Roll Forward] |  |
Balance as of January 1, | $ 75.1 | $ 79.3
Additions based on tax positions related to the current year | 2.9 | 3.6
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 6.8 | 5.6
Settlements with taxing authorities | 0.0 | (2.2)
Balance as of December 31, | 71.2 | $ 75.1
Conclusion of Examination by Tax Authorities [Member] |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Gross unrecognized tax benefits where settlement in next twelve months is reasonably possible | $ 47.7 |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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