Long-Term Debt and Financing (Details) (USD $)	1 Months Ended	3 Months Ended
	Feb. 28, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Long-Term Debt [Line Items]
Long-term debt, gross		$ 1,350,000,000
Unaccreted discount		(1,100,000)
Long-term debt		1,348,900,000		999,300,000
Change of control repurchase price percentage	101.00%
Financing Arrangements [Abstract]
Number of days due from receivable		30 days
Sale of receivable		133,000,000	181,000,000
Proceeds from sale and collection of receivables		192,300,000	162,700,000
Receivables from sale of receivables		127,900,000		189,800,000
Cash received from financing provider that has not been recognized as revenue		61,500,000		62,300,000
Financing guarantee with recourse [Member]
Financing Arrangements [Abstract]
Guarantor obligations, current carrying value		21,900,000
Maximum [Member]
Financing Arrangements [Abstract]
Maximum term for guarantees related to third-party financing arrangements		4 years
Fixed rate note due 2016 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross		300,000,000
Long-term debt, effective interest rate		3.25%
Long-term debt, stated interest rate		3.10%
Fixed rate note due 2021 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross		300,000,000
Long-term debt, effective interest rate		4.69%
Long-term debt, stated interest rate		4.60%
Fixed Rate Note Due 2024 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross		350,000,000
Long-term debt, effective interest rate		4.63%
Long-term debt, stated interest rate		4.50%
Fixed rate note due 2041 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross		$ 400,000,000
Long-term debt, effective interest rate		6.03%
Long-term debt, stated interest rate		5.95%