Financing Agreements - Additional Information (Details)	3 Months Ended					3 Months Ended
	Mar. 31, 2013 Senior Notes USD ($)	Mar. 31, 2013 Other Indebtedness USD ($)	Dec. 31, 2012 Other Indebtedness USD ($)	Jan. 31, 2011 Senior Notes Due 2019 USD ($)	Jan. 31, 2011 Senior Notes Due 2021 USD ($)	Mar. 31, 2013 Revolving Facility USD ($)	Mar. 31, 2013 Revolving Facility Minimum	Mar. 31, 2013 Revolving Facility Maximum	Mar. 31, 2013 Revolving Facility Letter of Credit USD ($)	Mar. 31, 2013 European Receivables Loan Facility USD ($)	Mar. 31, 2013 European Receivables Loan Facility EUR (€)
Debt Instrument [Line Items]
Carrying Value	$ 750,000,000	$ 131,000,000	$ 109,000,000
Senior notes issued				400,000,000	350,000,000
Senior notes issued, interest rate				6.50%	6.75%
Weighted-average interest rate on the Senior Notes	6.62%
Interest payment dates	semi-annually on February 15 and August 15
Current aggregate facility						500,000,000			300,000,000	96,000,000	75,000,000
Unused capacity, benchmark						50.00%
Percentage of applicable commitment fee							0.50%	0.625%
Percentage of fronting fee									0.25%
Line of Credit Facility, Amount Outstanding						0				0
Utilized letters of credit						71,000,000
Borrowing base collateral						366,000,000				96,000,000
Available borrowing capacity						$ 295,000,000
Revolving facility expiration						Feb. 29, 2016				Mar. 31, 2016	Mar. 31, 2016