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Fair Value Measurements Unobservable Inputs Rollforward (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration, Liability $ 3.8 $ 24.3 $ 24.3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance     2.0 3.7
Total realized/unrealized gains (losses) Included in other comprehensive income 0.8   2.0  
Ending balance 4.5 4.0 4.0 3.7
Foreign Currency Transaction Gain (Loss), Unrealized   (0.1)    
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration, Liability 3.8     3.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration, Liability 0     0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration, Liability 0     0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration, Liability $ 3.8     $ 3.8