Notes Payable and Long-Term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Oct. 31, 2014	Apr. 09, 2009	Apr. 12, 2013	Mar. 12, 2014
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.50%		0.80%
Debt, Weighted Average Interest Rate	3.70%		2.90%
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 1,027,800,000		$ 738,800,000
Current portion of long-term debt	6,800,000		22,500,000
Long-term debt, net of current portion	1,021,000,000		716,300,000
Long-term Debt, by Maturity [Abstract]
2015			623,700,000
2016			165,400,000
2017			33,600,000
2018			1,200,000
2019			135,200,000
After 2019			384,000,000
Total payments			1,343,100,000
Less: unamortized discounts			3,100,000
Total			1,340,000,000
Multi-currency revolving credit agreement, maximum borrowing capacity			1,250,000,000
Debt conversion, original debt, amount	373,800,000
Convertible bond settlement, shares	22,800,000
Conversion of convertible securities, value of shares issued	617,300,000
Convertible bond settlement	243,500,000
Treasury stock received from bond hedge, shares		13,000,000
Treasury stock received from bond hedge, value		503,900,000
Adjustments to additional paid in capital, bond hedge		503,900,000
Treasury stock issued due to settlement of warrant, shares		9,800,000
Treasury stock issue due to settlement of warrant, value		338,500,000
Adjustments to additional paid in capital, warrant		338,500,000
Estimated fair value of senior unsecured notes	729,700,000		750,300,000
Fair value higher than carrying value for senior unsecured notes	78,500,000		98,700,000
Outstanding letters of credit	27,800,000		28,300,000
Total Short Term Debt [Member]
Short-term debt
Total short-term debt	194,800,000		601,200,000
Short Term Borrowings [Member]
Short-term debt
Total short-term debt	84,800,000		601,200,000
Receivables Securitization [Member]
Short-term debt
Total short-term debt	110,000,000			110,000,000
Convertible Senior Notes Due April 2012 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Debt instrument par value					373,800,000
Debt instrument stated interest rate	3.50%
Long-term Debt, by Maturity [Abstract]
Interest expense		9,000,000
Non-cash portion		5,300,000
Senior Notes One [Member]
Long-term Debt, by Maturity [Abstract]
Bond hedge overlay at net pre-tax cost					25,200,000
Conversion premium after bond hedge overlay					50.00%
Conversion price per share after bond hedge overlay					$ 19.31
Senior Notes Due November 2016 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	149,700,000		149,800,000
Debt instrument par value			150,000,000
Debt instrument stated interest rate			5.75%
Debt instrument maturity period			Nov. 01, 2016
Senior Notes Due October 2019 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	133,900,000		134,000,000
Debt instrument par value			134,000,000
Debt instrument stated interest rate			8.00%
Debt instrument maturity period			Oct. 01, 2019
Senior Notes Due September 2020 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	248,200,000		248,400,000
Debt instrument par value			250,000,000
Debt instrument stated interest rate			4.625%
Debt instrument maturity period			Sep. 15, 2020
Senior Notes Due February 2029 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	119,400,000		119,400,000
Debt instrument par value			121,000,000
Debt instrument stated interest rate			7.125%
Debt instrument maturity period			Feb. 15, 2029
Multi Currency Revolving Credit Facility [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	320,000,000
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity			1,000,000,000			750,000,000
Multi-currency revolving credit agreement, maximum borrowing capacity			1,000,000,000
Commercial Paper [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt			460,900,000
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity							1,000,000,000.0
Term Loan Facilities And Other [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	40,400,000		75,100,000
Unamortized portion of debt derivative [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Total long-term debt	$ 16,200,000		$ 12,100,000