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Fair Value Measurements, Level 3 Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Contingent Consideration [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 1.7 $ 28.7
Additions 19.9 1.4
Payments (1.0) (27.3)
Change in fair value included in earnings (0.5) (1.2)
Currency translation 0 0.1
Ending Balance 20.1 1.7
Auction Rate Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 4.3 4.6
Sale of securities 0 (0.6)
Total unrealized gains included in other comprehensive income   0.3
Ending Balance $ 4.3 $ 4.3