Debt (Details 2) (USD $)	0 Months Ended			9 Months Ended						0 Months Ended					0 Months Ended
	Oct. 01, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Accounts receivable securitization program	Sep. 30, 2013 Accounts receivable securitization program	Dec. 31, 2013 Accounts receivable securitization program	Sep. 30, 2014 Term loan credit facility	May 31, 2014 Term loan credit facility	Dec. 31, 2013 Term loan credit facility	Oct. 01, 2014 Amended Line of Credit Facility	Sep. 30, 2014 Amended Line of Credit Facility	Jun. 30, 2014 Amended Line of Credit Facility	Sep. 30, 2014 Senior notes	Dec. 31, 2013 Senior notes	Oct. 01, 2014 Maximum [Member] Amended Line of Credit Facility	Oct. 01, 2014 Maximum [Member] Debt Instrument, Variable Rate Base Eurodollar Rate [Member] Amended Line of Credit Facility	Oct. 01, 2014 Maximum [Member] Debt Instrument, Variable Rate Base Rate [Member] Amended Line of Credit Facility	Oct. 01, 2014 Minimum [Member] Amended Line of Credit Facility	Oct. 01, 2014 Minimum [Member] Debt Instrument, Variable Rate Base Eurodollar Rate [Member] Amended Line of Credit Facility	Oct. 01, 2014 Minimum [Member] Debt Instrument, Variable Rate Base Rate [Member] Amended Line of Credit Facility
Entity's debt and other obligations
Maximum borrowing capacity				$ 150,000,000.0							$ 850,000,000	$ 630,000,000
Amount outstanding		612,100,000	683,000,000	150,000,000		150,000,000	0	125,000,000	125,000,000				370,000,000	370,000,000
Proceeds from the accounts receivable securitization program				775,400,000	741,200,000
Payments in respect of accounts receivable securitization program				$ 775,400,000	$ 741,200,000
Debt Instrument, Description of Variable Rate Basis	Eurodollar									Eurodollar, Federal Funds or prime rates
Debt Instrument, Basis Spread on Variable Rate																1.70%	0.70%		1.00%	0.00%
Line of Credit Facility, Commitment Fee Percentage															0.30%			0.13%