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Basis of Presentation and Significant Accounting Policies - Policies (Details) - USD ($) $ in Millions | May 01, 2016 | Dec. 31, 2016 | Jun. 23, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Previous percentage ownership of noncontrolling owners |  | 49.00% | 49.00% |
Other Investments |  |  |  |
Other investments |  | $ 67.2 |  | $ 71.1
Discontinued Operations, Disposed of by Sale | Pester |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash received for disposal of retail business | $ 32.3 |  |  |
Discontinued Operations, Disposed of by Sale | Pester | Other income |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (loss) on disposal of retail business | $ 3.8 |  |  |
Tobras |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Previous percentage of ownership of parent |  |  | 51.00% |

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