DEFINED BENEFIT PLANS, FAIR VALUE OF PLAN ASSETS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	$ 269.1		$ 268.1
Cash [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	4.1		2.7
U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	64.1	[1]	65.5	[1]
U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	25.3	[2]	25.1	[2]
U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	7.9	[3]	8.1	[3]
International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	36.0		40.3	[4]
Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	10.3	[5]	11.3	[5]
U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	115.1	[6]	104.1	[6]
Level 1 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	4.1		2.7
Level 1 [Member] | Cash [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	4.1		2.7
Level 1 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[1]	0	[1]
Level 1 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[2]	0	[2]
Level 1 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[3]	0	[3]
Level 1 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0		0	[4]
Level 1 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[5]	0	[5]
Level 1 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[6]	0	[6]
Level 2 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	265.0		265.4
Level 2 [Member] | Cash [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0		0
Level 2 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	64.1	[1]	65.5	[1]
Level 2 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	25.3	[2]	25.1	[2]
Level 2 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	7.9	[3]	8.1	[3]
Level 2 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	36.0		40.3	[4]
Level 2 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	10.3	[5]	11.3	[5]
Level 2 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	115.1	[6]	104.1	[6]
Level 3 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0		0
Level 3 [Member] | Cash [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0		0
Level 3 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[1]	0	[1]
Level 3 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[2]	0	[2]
Level 3 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[3]	0	[3]
Level 3 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0		0	[4]
Level 3 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[5]	0	[5]
Level 3 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	0	[6]	0	[6]
Pension Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plans, Assets for Plan Benefits	$ 269.1		$ 268.1		$ 256.8

[1] This category represents an equity index fund not actively managed that tracks the S&P 500 Index.

[2] This category represents an equity index fund not actively managed that tracks the S&P mid-cap 400 Index.

[3] This category represents an equity index fund not actively managed that tracks the Russell 2000 Index.

[4] This category represents an equity index fund not actively managed that tracks the MSCI ACWI ex USA Index.

[5] This category represents a commodities index fund not actively managed that tracks the Dow Jones - UBS Commodity Index.

[6] This category primarily represents bond index funds not actively managed that track the Barclays Capital U.S. Aggregate Index and Barclays Capital U.S. TIPS Index.