Debt (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 465.0
Line of Credit Facility, Maturity Date	Sep. 20, 2018
Line of Credit Facility, Interest Rate Description	Revolving borrowings under the Credit Facility bear interest, at our option, at either of the following and in each case plus an applicable margin:a base rate, which is the highest of (i) the Wells Fargo Bank, National Association prime rate, (ii) the Federal Funds Rate plus 0.500% and (iii) the London Interbank Offered Rate (LIBOR) Market Index Rate plus 1.000%; or the LIBOR. Borrowings by the Canadian Borrower bear interest, at the Canadian Borrower’s option, at either of the following and in each case plus an applicable margin:a base rate, which is the greatest of (i) the Canadian Reference Bank prime rate and (ii) the annual rate of interest equal to the sum of the Canadian Dealer Offered Rate (CDOR) plus 1.000%; or the CDOR. Borrowings by the Dutch Borrower bear interest at LIBOR plus an applicable margin.The interest rate margins on the borrowings and letters of credit are based on our leverage ratio and will range from 1.150% to 1.625% on CDOR, LIBOR and swingline loans, and from 0.150% to 0.625% on Base Rate and Canadian Base Rate loans.   Borrowings under the swingline loans are based on the LIBOR Market Index Rate plus any applicable margin.
Annual Facility Fee Percentage, Minimum	0.10%
Annual Facility Fee Percentage, Maximum	0.25%