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Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Unrecognized Tax Benefits [Line Items]      
Unrecognized tax benefits - beginning of year $ 20.8 $ 35.4 $ 38.8
Gross additions - current year tax positions 4.4 2.8 2.3
Gross additions - prior year tax positions 0.7 0.6 7.2
Gross additions - purchase accounting adjustments 1.6    
Gross reductions - prior year tax positions (3.2) (13.5) (12.0)
Gross reductions - settlements with taxing authorities (0.6) (4.0) (0.4)
Impact of change in foreign exchange rates     (0.5)
Impact due to expiration of statutes of limitations   (0.5)  
Unrecognized tax benefits - end of year $ 23.7 $ 20.8 $ 35.4