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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign Currency Transaction Gain, before Tax $ (0.1) $ 0.2      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 4.5 3.8 3.7   2.0
Assets, Fair Value Disclosure [Abstract]          
Business Combination, Contingent Consideration, Liability 3.8 7.2   24.3  
Fair Value, Measurements, Recurring [Member]
         
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 4.5   3.7    
Trading securities 2.2   2.0    
Business Combination, Contingent Consideration, Liability 3.8   3.8    
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
         
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 0   0    
Trading securities 2.2   2.0    
Business Combination, Contingent Consideration, Liability 0   0    
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
         
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 0   0    
Trading securities 0   0    
Business Combination, Contingent Consideration, Liability 0   0    
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
         
Assets, Fair Value Disclosure [Abstract]          
Available for sale securities 4.5   3.7    
Trading securities 0   0    
Business Combination, Contingent Consideration, Liability 3.8   3.8    
Senior Secured Notes Maturing 2017 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notes Payable, Fair Value Disclosure $ 373   $ 390