DEBT - SCHEDULE OF LONG-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Total long-term debt	$ 2,085.5	$ 1,826.7
Revolving credit facility [Member]
Debt Instrument [Line Items]
Total long-term debt	560.0	0
Senior notes due 2013 [Member]
Debt Instrument [Line Items]
Total long-term debt	350.5	350.9
Senior notes due 2015 [Member]
Debt Instrument [Line Items]
Total long-term debt	250.0	250.0
Senior notes due 2016 [Member]
Debt Instrument [Line Items]
Total long-term debt	325.0	325.0
Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	600.0	600.0
Term loan facility [Member]
Debt Instrument [Line Items]
Total long-term debt	0	300.0
Other long-term debt [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 0	$ 0.8