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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of unrecognized tax benefits [Roll Forward] |  |
Balance as of January 1 | $ 62.7 | $ 49.4
Additions based on tax positions related to the current year | 1.4 | 8.3
Settlements with taxing authorities | (10.2) | 0.0
Balance as of December 31 | 78.2 | $ 62.7
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 | $ 32.0 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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