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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of unrecognized tax benefits [Roll Forward] |  |
Balance as of January 1 | $ 49.4 | $ 37.6
Additions based on tax positions related to the current year | 8.3 | 8.0
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 5.0 |
Increase/(Decrease) related to tax positions of prior years |  | (3.8)
Lapse of statute of limitations | 0.0 | 0.0
Balance as of December 31 | 62.7 | $ 49.4
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 | $ 23.4 |

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