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Reconciliation of Restructuring Liability (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]      
Balance at December 31   $ 3.0 $ 6.1
Provision 0.4 1.0 0.7
Cash Expenditures   (2.7) (2.6)
Balance at June 30 4.2 1.3 4.2
Workforce reductions
     
Restructuring Cost and Reserve [Line Items]      
Balance at December 31   3.0 6.1
Provision   (0.1) 0.2
Cash Expenditures   (1.6) (2.1)
Balance at June 30 4.2 1.3 4.2
Other
     
Restructuring Cost and Reserve [Line Items]      
Provision   1.1 0.5
Cash Expenditures   $ (1.1) $ (0.5)