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Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 40.8 | $ 40.3 | $ 39.8 | $ 4.1
Tax positions taken in current year | 0.7 | 0.6 | 26.9 |
Tax positions taken in prior years | 0.7 | 1.2 | 10.4 |
Tax positions taken in current year | 0.0 | 0.0 | 0.0 |
Tax positions taken in prior years | 0.0 | (1.3) | 0.0 |
Settlements during the year | (0.9) | 0.0 | 0.0 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0.0 | 0.0 | $ (1.6) |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 40.2 | 39.9 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0.3 | 0.7 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 3.4 | $ 3.7 |  |

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