Notes Payable and Long-Term Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended					6 Months Ended									6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Multi Currency Revolving Credit Facility [Member]	Dec. 31, 2011 Multi Currency Revolving Credit Facility [Member]	Jun. 30, 2012 Senior Notes One [Member]	Dec. 31, 2011 Senior Notes One [Member]	Apr. 09, 2009 Senior Notes One [Member]	Jun. 30, 2012 Short Term Borrowings [Member]	Dec. 31, 2011 Short Term Borrowings [Member]	Jun. 30, 2012 Receivables Securitization [Member]	Dec. 31, 2011 Receivables Securitization [Member]	Jun. 30, 2012 Total Short Term Debt [Member]	Dec. 31, 2011 Total Short Term Debt [Member]	Jun. 30, 2012 5.75% Senior Notes [Member]	Dec. 31, 2011 5.75% Senior Notes [Member]	Jun. 30, 2012 8.00% Senior Notes [Member]	Dec. 31, 2011 8.00% Senior Notes [Member]	Jun. 30, 2012 4.625% Senior Notes [Member]	Dec. 31, 2011 4.625% Senior Notes [Member]	Jun. 30, 2012 7.125% Senior Notes [Member]	Dec. 31, 2011 7.125% Senior Notes [Member]	Jun. 30, 2012 Term Loan Facilities And Other [Member]	Dec. 31, 2011 Term Loan Facilities And Other [Member]	Jun. 30, 2012 Unamortized portion of debt derivative [Member]	Dec. 31, 2011 Unamortized portion of debt derivative [Member]
Short-term debt
Short-term Borrowings												$ 106,800,000	$ 116,300,000	$ 80,000,000	$ 80,000,000	$ 186,800,000	$ 196,300,000
Long-term debt
Long-term Debt		966,400,000		966,400,000		1,132,800,000	280,000,000	70,000,000	0	368,500,000								149,500,000	149,500,000	133,900,000	133,900,000	247,700,000	247,700,000	119,400,000	119,300,000	13,800,000	19,800,000	22,100,000	24,100,000
Current portion of long-term debt		10,200,000		10,200,000		381,500,000
Long-term debt, net of current portion		956,200,000		956,200,000		751,300,000
Debt instrument par value											373,800,000							150,000,000		134,000,000		250,000,000		121,000,000
Debt instrument stated interest rate		3.50%		3.50%					3.50%									5.75%		8.00%		4.625%		7.125%
Debt instrument maturity date									Apr. 15, 2012									Nov. 01, 2016		Oct. 01, 2019		Sep. 15, 2020		Feb. 15, 2029
Debt weighted average interest rate		3.90%		3.90%		5.90%
Multi-currency revolving credit facility, current borrowing capacity							650,000,000
Multi-currency revolving credit facility, maximum borrowing capacity							1,000,000,000
Conversion of convertible securities, shares issued				11.4
Conversion of convertible securities, value of shares issued				617,300,000
Debt Conversion, Original Debt, Amount				373,800,000
Adjustments to additional paid in capital, equity component of convertible debt, subsequent adjustments				243,500,000
Interest expense		1,400,000	8,300,000	9,000,000	16,300,000
Amortization of Debt Discount (Premium)		900,000	5,000,000	5,300,000	9,800,000
Bond hedge overlay at a net pre-tax cost									25,200,000
Conversion premium after bond hedge overlay									50.00%
Conversion price per share after bond hedge overlay									$ 38.61
Treasury stock received from bond hedge, shares				6.5
Adjustments to Additional Paid in Capital, Convertible Bond Hedge				503,900,000
Treasury stock received from bond hedge, value				503,900,000
Settlement of warrant, shares	2.3
Settlement of warrant, treasury share value	148,700,000
Adjustments to Additional Paid in Capital, Warrant	148,700,000
Estimated fair value of senior unsecured notes		777,000,000		777,000,000		1,454,400,000
Fair value higher than carrying value for senior unsecured notes		126,500,000		126,500,000		435,500,000
Outstanding letter of credit		$ 50,000,000		$ 50,000,000		$ 50,000,000