DEBT (Details) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	Mar. 09, 2011	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Schedule of short-term debt instruments
Zero-coupon convertible subordinated notes		$ 140,100,000		$ 286,700,000
Term loan, current		75,000,000		75,000,000
Total short-term borrowings and current portion of long-term debt		215,100,000		361,700,000
Long-term debt by instrument [Abstract]
Long-term debt		1,788,200,000		1,826,700,000
Zero-coupon Subordinated Notes
Principal amount at maturity of zero-coupon subordinated notes converted		183,200,000
Cash used for zero-coupon subordinated notes conversions		149,100,000	4,300,000
Common stock issued upon conversion of zero-coupon subordinated notes (in shares)		0.9
Value of cash and common stock in connection with conversions of zero-coupon subordinated notes, settled in current period		240,700,000
Tax benefit realized in connection with common stock issued upon conversion of zero-coupon subordinated notes		36,100,000
Minimum contingent cash interest rate on zero-coupon subordinated notes (in hundredths)		0.125%
Number of trading days used to establish contingent cash interest rate on zero-coupon subordinated notes (in days)	5
Announcement date that zero-coupon subordinated notes may be converted into cash and common stock at the stock conversion rate		Jul. 01, 2011
Date of the terms for the zero-coupon subordinated notes and indenture		Oct. 24, 2006
Zero-coupon subordinated notes exercise period, beginning		Jul. 01, 2011
Zero-coupon subordinated notes exercise period, ending		Sep. 30, 2011
Stock conversion rate for zero-coupon subordinated notes (per thousand)		13.4108
Principal amount of zero-coupon subordinated notes		1,000
Credit Facilities
Outstanding balance on the Term Loan Facility		337,500,000		375,000,000
Revolving credit facility		0		0
Debt covenants, maximum leverage ratio		2.5 to 1.0
Debt covenants, minimum interest coverage ratio		5.0 to 1.0
Debt covenants, maximum leverage ratio before dividend payout		2.0 to 1.
Leverage ratio		1.6 to 1.0
Interest coverage ratio		14.9 to 1.0
Debt covenant compliance		in compliance
Effective interest rate on Term Loan Facility (in hundredths)		0.87%
Effective interest rate on Revolving Facility (in hundredths)		0.54%
Senior notes due 2013 [Member]
Long-term debt by instrument [Abstract]
Long-term debt		350,700,000		350,900,000
Maturity date		Jan. 31, 2013
Senior notes due 2015 [Member]
Long-term debt by instrument [Abstract]
Long-term debt		250,000,000		250,000,000
Maturity date		Dec. 15, 2015
Senior notes due 2016 [Member]
Long-term debt by instrument [Abstract]
Long-term debt		325,000,000		325,000,000
Maturity date		May 15, 2016
Senior notes due 2020 [Member]
Long-term debt by instrument [Abstract]
Long-term debt		600,000,000		600,000,000
Maturity date		Nov. 15, 2020
Term loan, non-current [Member]
Long-term debt by instrument [Abstract]
Long-term debt		262,500,000		300,000,000
Other long-term debt [Member]
Long-term debt by instrument [Abstract]
Long-term debt		$ 0		$ 800,000