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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                        
Units purchased (in units) 400,000                 400,000    
Purchase of available-for-sale securities                   $ 14.4 $ 0.0 $ 78.3
Proceeds from sale of available-for-sale securities                   19.3 68.0 0.0
Other income (expense), net   $ 0.3 $ 5.0 $ 0.1 $ 0.3 $ 0.2 $ 0.3 $ 0.2 $ 36.0 5.7 36.7 (3.7)
Sale proceeds                   4.9    
Aggregate cost basis for available-for-sale securities           $ 47.9         47.9 73.6
Available-for-sale securities transferred to trading                 $ 25.7      
Proceeds from trading securities               $ 37.8        
Realized gain on trading securities                     0.4  
Other than temporary impairment losses                       $ 4.7
Accumulated Net Unrealized Investment Gain | Reclassification out of Accumulated Other Comprehensive Income                        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                        
Other income (expense), net                   $ 0.5 20.1  
Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities | Reclassification out of Accumulated Other Comprehensive Income                        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                        
Other income (expense), net                     $ 11.7  
East Dubuque Merger | CVR Partners, LP                        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                        
Units purchased (in units)       400,000