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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Contingent payment arrangements
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities 31.0
Contingent payment arrangements | Discounted cash flow | Minimum
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Growth rate (as a percent) 6.00%
Discount rate (as a percent) 14.00%
Contingent payment arrangements | Discounted cash flow | Maximum
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Growth rate (as a percent) 12.00%
Discount rate (as a percent) 18.00%
Affiliate equity repurchase obligations
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities 9.4
Affiliate equity repurchase obligations | Discounted cash flow | Minimum
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Growth rate (as a percent) (10.00%)
Discount rate (as a percent) 15.00%
Affiliate equity repurchase obligations | Discounted cash flow | Maximum
 
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Growth rate (as a percent) 17.00%
Discount rate (as a percent) 24.00%