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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Adjustment to contingent consideration fair value $ 3.2 $ 17.3 $ 20.5 $ 0 $ 0
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 3.7   3.7    
Contingent Consideration, Liability 2.1   2.1 0  
Fair Value, Inputs, Level 2
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of Long-Lived Assets to be Disposed of       4.4 6.9
Assets, Fair Value Disclosure [Abstract]          
Impairment of Long-Lived Assets Held-for-use         4.9
Assets Held-for-sale, Long Lived, Fair Value Disclosure       15.0  
Fair Value, Measurements, Recurring
          
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 3.7   3.7 2.0  
Trading securities 2.0   2.0 1.7  
Contingent Consideration, Liability 3.8   3.8 0 0
Total       3.7  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
          
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 0   0 0  
Trading securities 2.0   2.0 1.7  
Contingent Consideration, Liability 0   0    
Total       1.7  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
          
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 0   0 0  
Trading securities 0   0 0  
Contingent Consideration, Liability 0   0    
Total       0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
          
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 3.7   3.7 2.0  
Trading securities 0   0 0  
Contingent Consideration, Liability 3.8   3.8    
Total       $ 2.0