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EMPLOYEE BENEFIT PLANS (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan Assets
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets $ 846.6 $ 729.9  
401(h) other benefit plan assets invested as pension assets (8.2) (7.4)  
Total 838.4 722.5  
Pension Plan Assets | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 20.8 16.6  
Pension Plan Assets | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 294.0 299.8  
Pension Plan Assets | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 292.8 208.2  
Pension Plan Assets | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 50.4 52.7  
Pension Plan Assets | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 10.4 12.9  
Pension Plan Assets | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 135.5 104.1  
Pension Plan Assets | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 33.3 29.7  
Pension Plan Assets | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 9.4 5.9  
Pension Plan Assets | Level 1
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 116.7 141.9  
401(h) other benefit plan assets invested as pension assets (1.1) (1.5)  
Total 115.6 140.4  
Pension Plan Assets | Level 1 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 1.1 3.3  
Pension Plan Assets | Level 1 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 54.1 88.2  
Pension Plan Assets | Level 1 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 61.5 50.4  
Pension Plan Assets | Level 1 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 1 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 1 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 1 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 1 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 2
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 727.9 585.3  
401(h) other benefit plan assets invested as pension assets (7.1) (5.9)  
Total 720.8 579.4  
Pension Plan Assets | Level 2 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 19.7 13.3  
Pension Plan Assets | Level 2 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 239.9 211.6  
Pension Plan Assets | Level 2 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 231.3 157.8  
Pension Plan Assets | Level 2 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 50.4 52.7  
Pension Plan Assets | Level 2 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 9.1 10.7  
Pension Plan Assets | Level 2 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 134.8 103.6  
Pension Plan Assets | Level 2 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 33.3 29.7  
Pension Plan Assets | Level 2 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 9.4 5.9  
Pension Plan Assets | Level 3
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 2.0 2.7 3.9
401(h) other benefit plan assets invested as pension assets 0 0  
Total 2.0 2.7  
Pension Plan Assets | Level 3 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 3 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 3 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 3 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 3 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 1.3 2.2 2.8
Pension Plan Assets | Level 3 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0.7 0.5 1.1
Pension Plan Assets | Level 3 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Pension Plan Assets | Level 3 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 228.5 206.6  
401(h) other benefit plan assets invested as pension assets 8.2 7.4  
Total 236.7 214.0  
Other Benefit Plan Assets | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 2.3 4.0  
Other Benefit Plan Assets | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 80.7 84.4  
Other Benefit Plan Assets | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 80.0 58.3  
Other Benefit Plan Assets | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 65.6 61.0  
Other Benefit Plan Assets | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets (0.1) (1.1)  
Other Benefit Plan Assets | Level 1
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 95.8 97.0  
401(h) other benefit plan assets invested as pension assets 1.1 1.5  
Total 96.9 98.5  
Other Benefit Plan Assets | Level 1 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 1 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 14.2 23.8  
Other Benefit Plan Assets | Level 1 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 16.7 13.3  
Other Benefit Plan Assets | Level 1 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 65.0 61.0  
Other Benefit Plan Assets | Level 1 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 1 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 1 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 1 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets (0.1) (1.1)  
Other Benefit Plan Assets | Level 2
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 132.7 109.6  
401(h) other benefit plan assets invested as pension assets 7.1 5.9  
Total 139.8 115.5  
Other Benefit Plan Assets | Level 2 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 2.3 4.0  
Other Benefit Plan Assets | Level 2 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 66.5 60.6  
Other Benefit Plan Assets | Level 2 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 63.3 45.0  
Other Benefit Plan Assets | Level 2 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0.6 0  
Other Benefit Plan Assets | Level 2 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 2 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 2 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 2 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
401(h) other benefit plan assets invested as pension assets 0 0  
Total 0 0  
Other Benefit Plan Assets | Level 3 | Cash and cash equivalents
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | United States equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | International equity
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | United States government
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | Foreign government debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | Corporate debt
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | Asset-backed securities
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets 0 0  
Other Benefit Plan Assets | Level 3 | Other
      
Investments recorded at fair value, by asset class      
Fair value of plan assets before the adjustment for 401(h) other benefit plan assets invested as pension assets $ 0 $ 0