Indebtedness (Components Of Indebtedness) (Details)	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 1 1/4% Convertible Senior Subordinated Notes Due 2036 [Member]	Dec. 31, 2012 1 1/4% Convertible Senior Subordinated Notes Due 2036 [Member]	Mar. 31, 2013 4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member] USD ($)	Mar. 31, 2013 4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member] EUR (€)	Dec. 31, 2012 4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member] USD ($)	Mar. 31, 2013 5 7/8% Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2012 5 7/8% Senior Notes due 2021 [Member] USD ($)
Debt Instrument [Line Items]
Debt instrument, interest rate			1.25%	1.25%	4.50%	4.50%	4.50%	5.875%	5.875%
Credit facility	$ 591,900,000	$ 465,000,000
Convertible Debt	194,400,000	192,100,000
Senior Notes					256,400,000	200,000,000.0	264,200,000	300,000,000	300,000,000
Other long-term debt	92,300,000	65,500,000
Total indebtedness	1,435,000,000	1,286,800,000
Less: Current portion of long-term debt	(85,500,000)	(59,100,000)
Convertible Notes Payable, Current	(194,400,000)	(192,100,000)
Total indebtedness, less current portion	$ 1,155,100,000	$ 1,035,600,000