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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Provisional income tax expense | $ 0.8 |  | $ 315.9
Provisional income tax expense for net transition tax |  |  | 202.7
Tax expense from remeasurement of deferred tax assets |  |  | $ 113.2
Total before tax | 331.8 | $ 54.4 |
Income tax expense | $ 68.7 | $ 9.4 |
Effective tax rate (percent) | 20.70% | 17.30% |
Discrete Items, Before Tax: |  |  |
Acquisition related charges | $ 2.7 | $ 9.2 |
Currency remeasurement | 0.5 | 5.1 |
Other discrete items | (51.5) | 38.1 |
Tax only discrete items | 0.0 | 0.0 |
Total discrete items | (48.3) | 52.4 |
Continuing operations, before discrete items | 283.5 | 106.8 |
Discrete Items, Tax: |  |  |
Acquisition related charges | 0.6 | 2.6 |
Currency remeasurement | 0.9 | 2.6 |
Other discrete items | (17.7) | 2.1 |
Tax only discrete items | (7.4) | (4.0) |
Total discrete items | (23.6) | 3.3 |
Continuing operations, before discrete items | $ 45.1 | $ 12.7 |
Effective tax rate percent | 15.90% | 11.90% |

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