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% |