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Commitments and Contingencies - Schedule of Minimum Rental Commitments Under Noncancelable Leases (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Commitments And Contingencies [Line Items]  
Minimum Rental Commitments - Capital leases, Total $ 5.6
Minimum Rental Commitments - Capital leases, 2013 2.5
Minimum Rental Commitments - Capital leases, 2014 1.9
Minimum Rental Commitments - Capital leases, 2015 0.9
Minimum Rental Commitments - Capital leases, 2016 0.3
Minimum Rental Commitments - Capital leases, 2017   
Minimum Rental Commitments - Capital leases, Thereafter   
Minimum Rental Commitments - Operating leases, Total 62.8
Minimum Rental Commitments - Operating leases, 2013 18.1
Minimum Rental Commitments - Operating leases, 2014 13.5
Minimum Rental Commitments - Operating leases, 2015 6.6
Minimum Rental Commitments - Operating leases, 2016 5.9
Minimum Rental Commitments - Operating leases, 2017 3.4
Minimum Rental Commitments - Operating leases, Thereafter $ 15.3