Commitments and Contingencies

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies

15. Commitments and Contingencies

Operating Lease Agreements

We lease certain office space, warehouse space and equipment under operating leases. Minimum rental commitments under operating leases at December 31, 2011 are as follows:

Years Ended December 31,	Minimum Rental Commitments
2012	$	11.5
2013		8.3
2014		6.2
2015		5.4
2016		2.6
Thereafter		3.1
Total minimum lease payments	$	37.1

Rental expense for operating leases was $14.2, $14.2 and $16.8 for the years ended December 31, 2011, 2010 and 2009, respectively.

Pension Fund Withdrawal Obligation

During 2007, we discontinued our participation in a multiemployer pension fund. In connection with our cessation of contributions to the plan, we were assessed a withdrawal liability of approximately $5.6, which we are paying in monthly installments through 2021. As of December 31, 2011, our total withdrawal liability, including interest and amortization charges, amounted to approximately $6.0.

Letters of Credit

Letters of credit outstanding at December 31, 2011 consist of letters of credit in the amount of $14.0 in conjunction with the IRBs (see Note 9) and other letters of credit aggregating $9.9 (total letters of credit of $23.9 at December 31, 2011). Other letters of credit consist primarily of collateral support for our property and casualty insurance program. All letters of credit reduce the amount available to borrow under the ABL facility.

Contingencies

From time to time, we are involved in a variety of claims, lawsuits and other disputes arising in the ordinary course of business. We believe the resolution of these matters and the incurrence of their related costs and expenses should not have a material effect on our consolidated financial position, results of operations or liquidity.