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Fair Value Measurements, Level 3 Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Contingent Consideration [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 28.7 $ 0.6
Additions 1.4 23.5
Payments (27.3) (0.7)
Change in fair value included in earnings (1.2) 5.2
Currency translation 0.1 0.1
Ending Balance 1.7 28.7
Auction Rate Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 4.6 5.4
Sale of securities (0.6) (0.7)
Total unrealized gains (losses) included in other comprehensive income 0.3 (0.1)
Ending Balance $ 4.3 $ 4.6