Notes Payable and Long-Term Debt (Details) (USD $)									9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Short Term Borrowings [Member]	Dec. 31, 2013 Short Term Borrowings [Member]	Sep. 30, 2014 Receivables Securitization [Member]	Dec. 31, 2013 Receivables Securitization [Member]	Sep. 30, 2014 Total Short Term Debt [Member]	Dec. 31, 2013 Total Short Term Debt [Member]	Sep. 30, 2014 5.75% Senior Notes [Member]	Dec. 31, 2013 5.75% Senior Notes [Member]	Sep. 30, 2014 8.00% Senior Notes [Member]	Dec. 31, 2013 8.00% Senior Notes [Member]	Sep. 30, 2014 4.625% Senior Notes [Member]	Dec. 31, 2013 4.625% Senior Notes [Member]	Sep. 30, 2014 7.125% Senior Notes [Member]	Dec. 31, 2013 7.125% Senior Notes [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Sep. 30, 2014 Term Loan Facilities And Other [Member]	Dec. 31, 2013 Term Loan Facilities And Other [Member]	Sep. 30, 2014 Unamortized portion of debt derivative [Member]	Dec. 31, 2013 Unamortized portion of debt derivative [Member]	Sep. 30, 2014 Commercial Paper [Member]	Mar. 12, 2014 Commercial Paper [Member]
Short-term debt
Short-term borrowings			$ 478,000,000	$ 84,800,000	$ 110,000,000	$ 110,000,000	$ 588,000,000	$ 194,800,000
Long-term debt
Long-term debt	723,500,000	1,027,800,000							149,700,000	149,700,000	134,000,000	133,900,000	248,400,000	248,200,000	119,400,000	119,400,000	0		320,000,000	58,800,000	40,400,000	13,200,000	16,200,000	355,000,000
Current portion of long-term debt	17,700,000	6,800,000
Long-term debt, net of current portion	705,800,000	1,021,000,000
Debt instrument par value									150,000,000		134,000,000		250,000,000		121,000,000
Debt instrument stated interest rate									5.75%		8.00%		4.625%		7.125%
Debt instrument maturity date									Nov. 01, 2016		Oct. 01, 2019		Sep. 15, 2020		Feb. 15, 2029
Debt weighted average interest rate	3.30%	3.70%
Current borrowing capacity																	1,000,000,000	750,000,000							1,000,000,000.0
Maximum borrowing capacity	1,250,000,000																1,000,000,000
Estimated fair value of senior unsecured notes	749,100,000	729,700,000
Fair value higher than carrying value for senior unsecured notes	97,600,000	78,500,000
Letters of Credit Outstanding, Amount	$ 29,200,000	$ 27,800,000