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Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value   $ 47.6  
Investment Owned, at Fair Value   552.8  
Contingent consideration at Fair Value   10.3  
Total liabilities at fair value   10.3  
Municipal Bonds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   4.5  
US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   5.1  
Total Assets at Fair Value   600.4  
Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value   31.8  
Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0.9  
US Government Agencies Debt Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   5.3  
Fair Value, Inputs, level 1 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value   36.9  
Investment Owned, at Fair Value   552.8  
Contingent consideration at Fair Value   0  
Total liabilities at fair value   0  
Fair Value, Inputs, level 1 [Member] | Municipal Bonds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Inputs, level 1 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   5.1  
Total Assets at Fair Value   589.7  
Fair Value, Inputs, level 1 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value   31.8  
Fair Value, Inputs, level 1 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Inputs, level 1 [Member] | US Government Agencies Debt Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Inputs, level 2 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value   10.7  
Investment Owned, at Fair Value   0  
Contingent consideration at Fair Value   0  
Total liabilities at fair value   0  
Fair Value, Inputs, level 2 [Member] | Municipal Bonds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   4.5  
Fair Value, Inputs, level 2 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Total Assets at Fair Value   10.7  
Fair Value, Inputs, level 2 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value   0  
Fair Value, Inputs, level 2 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0.9  
Fair Value, Inputs, level 2 [Member] | US Government Agencies Debt Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   5.3  
Fair Value, Inputs, level 3 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value   0  
Investment Owned, at Fair Value   0  
Contingent consideration at Fair Value   10.3  
Total liabilities at fair value   10.3  
Fair Value, Inputs, level 3 [Member] | Municipal Bonds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Inputs, level 3 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Total Assets at Fair Value   0  
Fair Value, Inputs, level 3 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value   0  
Fair Value, Inputs, level 3 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Inputs, level 3 [Member] | US Government Agencies Debt Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value   0  
Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value 56.6    
Investment Owned, at Fair Value 721.7    
Total Assets at Fair Value 778.3    
Derivative Liability, Fair Value, Gross Liability 1.0    
Contingent consideration at Fair Value 12.6    
Total liabilities at fair value 13.6    
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 17.5    
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value 38.7    
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 0.4    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value 56.2    
Investment Owned, at Fair Value 721.7    
Total Assets at Fair Value 777.9    
Derivative Liability, Fair Value, Gross Liability 0    
Contingent consideration at Fair Value 0    
Total liabilities at fair value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 17.5    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value 38.7    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value 0.4    
Investment Owned, at Fair Value 0    
Total Assets at Fair Value 0.4    
Derivative Liability, Fair Value, Gross Liability 1.0    
Contingent consideration at Fair Value 0    
Total liabilities at fair value 1.0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 0.4    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable Securities at Fair Value 0    
Investment Owned, at Fair Value 0    
Total Assets at Fair Value 0    
Derivative Liability, Fair Value, Gross Liability 0    
Contingent consideration at Fair Value 12.6 10.3 9.5
Total liabilities at fair value 12.6    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] | US Treasury Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] | Mutual funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading Securities at Fair Value 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] | Asset-backed Securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities at Fair Value $ 0