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Fair Value Measurements Unobservable Inputs Rollforward (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 Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability $ 2.1   $ 2.1 $ 0  
Adjustment to contingent consideration fair value (3.2) (17.3) (20.5) 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance     2.0 0.7  
Realized gains from the sale of investments     0 0 15.2
Included in other comprehensive income     1.7 1.3  
Ending balance 3.7   3.7 2.0 0.7
Fair Value, Measurements, Recurring
          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability 3.8   3.8 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability 0   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability 0   0    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability 3.8   3.8    
Long-Term Liability [Member]
          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent Consideration, Liability $ 24.3   $ 24.3