SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash paid during period for:
Interest	$ 99.6	$ 55.5	$ 50.7
Income taxes, net of refunds	309.4	355.0	304.1
Disclosure of non-cash financing and investing activities
Surrender of restricted stock awards and performance shares	6.0	2.4	2.7
Conversion of zero-coupon convertible debt	36.2	1.1	11.4
Accrued repurchases of common stock	0	(0.5)	0.5
Purchase of equipment in accrued expenses	$ 0	$ 0	$ 2.8