EMPLOYEE BENEFIT PLANS (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total
Fair value of plan assets, by asset category
Total	$ 149.2	$ 126.0
Quoted Prices in Active Markets (Level 1)
Fair value of plan assets, by asset category
Total	117.2	95.7
Significant Observable Inputs (Level 2)
Fair value of plan assets, by asset category
Total	23.4	21.7
Significant Unobservable Inputs
Fair value of plan assets, by asset category
Total	8.6	8.6
Pension Benefits
Fair value of plan assets, by asset category
Total	149.2	126.0	137.9
Pension Benefits | Total | Cash
Fair value of plan assets, by asset category
Total	8.3	5.1
Pension Benefits | Total | U.S. large-cap
Fair value of plan assets, by asset category
Total	53.8	50.2
Pension Benefits | Total | U.S. mid- and small-cap
Fair value of plan assets, by asset category
Total	29.8	15.6
Pension Benefits | Total | International large-cap
Fair value of plan assets, by asset category
Total	16.7	13.6
Pension Benefits | Total | International mid-cap
Fair value of plan assets, by asset category
Total		11.2
Pension Benefits | Total | International small-cap
Fair value of plan assets, by asset category
Total	4.3
Pension Benefits | Total | U.S. Treasuries
Fair value of plan assets, by asset category
Total	0.8	0.3
Pension Benefits | Total | Municipal bonds
Fair value of plan assets, by asset category
Total	0.2	0.1
Pension Benefits | Total | Investment grade U.S. corporate bonds
Fair value of plan assets, by asset category
Total	2.0	1.5
Pension Benefits | Total | High-yield U.S. corporate bonds
Fair value of plan assets, by asset category
Total	6.4	4.7
Pension Benefits | Total | Emerging markets fixed income
Fair value of plan assets, by asset category
Total	4.3
Pension Benefits | Total | Mortgage-backed securities
Fair value of plan assets, by asset category
Total	14.0	15.1
Pension Benefits | Total | Real estate partnerships interests
Fair value of plan assets, by asset category
Total	7.8	7.1
Pension Benefits | Total | Private equity partnership interests
Fair value of plan assets, by asset category
Total	0.8	0.8
Pension Benefits | Total | Insurance contracts
Fair value of plan assets, by asset category
Total		0.7
Pension Benefits | Quoted Prices in Active Markets (Level 1) | Cash
Fair value of plan assets, by asset category
Total	8.3	5.1
Pension Benefits | Quoted Prices in Active Markets (Level 1) | U.S. large-cap
Fair value of plan assets, by asset category
Total	53.8	50.2
Pension Benefits | Quoted Prices in Active Markets (Level 1) | U.S. mid- and small-cap
Fair value of plan assets, by asset category
Total	29.8	15.6
Pension Benefits | Quoted Prices in Active Markets (Level 1) | International large-cap
Fair value of plan assets, by asset category
Total	16.7	13.6
Pension Benefits | Quoted Prices in Active Markets (Level 1) | International mid-cap
Fair value of plan assets, by asset category
Total		11.2
Pension Benefits | Quoted Prices in Active Markets (Level 1) | International small-cap
Fair value of plan assets, by asset category
Total	4.3
Pension Benefits | Quoted Prices in Active Markets (Level 1) | Emerging markets fixed income
Fair value of plan assets, by asset category
Total	4.3
Pension Benefits | Significant Observable Inputs (Level 2) | U.S. Treasuries
Fair value of plan assets, by asset category
Total	0.8	0.3
Pension Benefits | Significant Observable Inputs (Level 2) | Municipal bonds
Fair value of plan assets, by asset category
Total	0.2	0.1
Pension Benefits | Significant Observable Inputs (Level 2) | Investment grade U.S. corporate bonds
Fair value of plan assets, by asset category
Total	2.0	1.5
Pension Benefits | Significant Observable Inputs (Level 2) | High-yield U.S. corporate bonds
Fair value of plan assets, by asset category
Total	6.4	4.7
Pension Benefits | Significant Observable Inputs (Level 2) | Mortgage-backed securities
Fair value of plan assets, by asset category
Total	14.0	15.1
Pension Benefits | Significant Unobservable Inputs | Real estate partnerships interests
Fair value of plan assets, by asset category
Total	7.8	7.1
Pension Benefits | Significant Unobservable Inputs | Private equity partnership interests
Fair value of plan assets, by asset category
Total	0.8	0.8
Pension Benefits | Significant Unobservable Inputs | Insurance contracts
Fair value of plan assets, by asset category
Total		$ 0.7