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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Apr. 01, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Intangible Assets          
Amortization and impairment expenses of intangible assets   $ 28.1 $ 32.6 $ 55.5 $ 65.5
Tax deduction period for goodwill and client relationships amortization expense 15 years        
Annual amortization expense attributable to current equity method Affiliates for next five years          
2014   110.0   110.0  
2015   110.0   110.0  
2016   110.0   110.0  
EIG Global Energy Partners, LLC
         
Intangible Assets          
Acquired client relationships 115.0        
Acquired Client Relationships
         
Intangible Assets          
Weighted average life       10 years  
Amortization and impairment expenses of intangible assets   28.1 32.6 55.5 65.5
Annual amortization expense attributable to current equity method Affiliates for next five years          
2017   110.0   110.0  
2018   110.0   110.0  
Acquired Client Relationships | EIG Global Energy Partners, LLC
         
Intangible Assets          
Weighted average life       12 years  
Amortization and impairment expenses of intangible assets   7.3 10.3 12.7 20.7
Annual amortization expense attributable to current equity method Affiliates for next five years          
2014   26.4   26.4  
2015   20.2   20.2  
2016   17.6   17.6  
2017   17.7   17.7  
2018   $ 17.7   $ 17.7