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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%