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Income Taxes Uncertain Income Tax Positions (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) jurisdiction | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |
Number of significant foreign jurisdictions | jurisdiction |  |  |  | 16 |  |
Unrecognized tax benefits | $ 79.1 | $ 111.6 | $ 111.6 | $ 79.1 | $ 84.0 | $ 111.6
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 29.5 | 22.5 |
Interest and penalties recognized | 0.9 | 5.2 | 4.4 |  |  |
Interest and penalties accrued |  |  |  | 14.0 | 13.1 |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Balance at beginning of year | 84.0 | 111.6 | 97.1 |  |  |
Increases related to positions taken in the current year | 11.8 | 9.4 | 22.3 |  |  |
Decreases related to positions taken in prior years | (1.8) | (4.6) |  |  |  |
Increases related to positions taken in prior years |  |  | 2.6 |  |  |
Decreases related to lapse of statutes of limitations | (13.5) | (14.2) | (10.2) |  |  |
Settlements during the current year | (1.4) | (0.3) | (0.2) |  |  |
Decreases for tax positions on dispositions | 0.0 | (17.9) | 0.0 |  |  |
Balance at end of year | $ 79.1 | $ 84.0 | $ 111.6 |  |  |
Offsetting non-current deferred tax asset |  |  |  | 45.3 | $ 59.8 | $ 74.4
Minimum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Possible decrease in unrecognized tax benefits |  |  |  | 10.1 |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Possible decrease in unrecognized tax benefits |  |  |  | $ 16.5 |  |

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