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Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 01, 2017
Excluding discrete items [Line Items] |  |  |  |  |  |
Unrecognized Tax Benefits |  | $ 13.0 |  |  |  | $ 39.1
Provision (benefit) for income taxes | $ (8.1) |  | $ 21.5 | $ 7.4 | $ 50.6 |
Effective Income Tax Rate Reconciliation, Percent | (11.00%) |  | 30.80% | 5.80% | 30.70% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | 1.5 |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | (1.3) |  | $ (34.0) |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ (26.3) |  |  |  |
excluding discrete items [Member] |  |  |  |  |  |
Excluding discrete items [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 30.80% |  |  |

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