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Other Tax Disclosure (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized Tax Benefits |  | $ 38.7 | $ 47.7 | $ 28.2 | $ 41.6
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 22.9 | 3.7 | 1.2 | 17.3 |
Total Payments to Taxing Authority Regarding Transfer Pricing Issues, Including Payments Which Decreased Unrecognized Tax Benefits |  |  |  | 28.0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | (1.0) | (3.1) | 1.5 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 6.9 | $ 7.5 | $ 2.5 | $ 6.9
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | $ 42.4 |  |  |

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