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Commitments and contingencies - Change in Accrued Environmental Remediation and Related Costs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments And Contingent Liabilities [Line Items]      
Balance at the beginning of the year $ 43.2 $ 42.3 $ 48.9
Additions charged to expense, net 15.0 11.3 0.4
Settlement agreement     (2.0)
Payments, net (8.1) (10.4) (5.0)
Changes in currency exchange rates 0.1    
Balance at the end of the year 50.2 43.2 42.3
Amounts recognized in our Consolidated Balance Sheet at the end of the year:      
Current liabilities 7.6 8.6 9.7
Noncurrent liabilities 42.6 34.6 32.6
Total $ 50.2 $ 43.2 $ 42.3