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Change in Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (76.4) $ (41.6) $ (39.3)
Foreign currency translation adjustment 11.1 (4.3) (4.5)
Unrealized net gain (loss) on derivatives, net of tax expense of $0.2, $0.1 and $0.0, respectively 0.7 (0.7) 0.8
Change in unrecognized gains (losses) related to pension benefit plans, net of tax benefit (expense) of $0.3, $1.6 and $0.0, respectively (15.5) (29.8) 1.4
Ending balance $ (80.1) $ (76.4) $ (41.6)