FAIR VALUE MEASUREMENTS (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	$ 9.4	$ 13.8	$ 8.4
Commodity forward contracts			8.6
Interest rate swaps	11.6	13.7	8.5
Commodity forward contracts	7.7	10.2	0.1
Earn out	35.3	49.0	43.2
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	9.4	13.8	8.4
Commodity forward contracts			5.3
Interest rate swaps	11.6	13.7	8.5
Commodity forward contracts	6.4	7.7	0.1
Earn out	0	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	0	0	0
Commodity forward contracts			0
Interest rate swaps	0	0	0
Commodity forward contracts	0	0	0
Earn out	35.3	49.0	43.2
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	0	0	0
Commodity forward contracts			3.3
Interest rate swaps	0	0	0
Commodity forward contracts	1.3	2.5	0
Earn out	$ 0	$ 0	$ 0