EMPLOYEE RETIREMENT PLANS (Details 2) (Pension Benefits, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	$ 638.2	$ 659.4	$ 115.8
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year			115.8
Fair value of plan assets, end of year	638.2	659.4	115.8
Short-term investment fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	10.2	5.7
Percentage of Assets	2.00%	1.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	10.2	5.7
Receivables
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		86.7
Percentage of Assets		13.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		86.7
U.S. equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	275.8	202.7
Target Allocation (as a percent)	41.00%	43.00%
Percentage of Assets	43.00%	31.00%
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	202.7
Fair value of plan assets, end of year	275.8	202.7
Consumer Discretionary Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	4.3	6.6
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	4.3	6.6
Consumer Staples Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	6.1	9.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	6.1	9.2
Energy Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.3	1.3
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	1.3	1.3
Finance Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	2.3	3.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	2.3	3.8
Health Care Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	9.9	8.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	9.9	8.4
Index funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	141.3	93.6
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	141.3	93.6
Industrials Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	3.5	2.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	3.5	2.8
Information Technology Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	3.7	7.3
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	3.7	7.3
Capital appreciation mutual fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	39.4	13.1
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	39.4	13.1
Small cap growth mutual fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	7.2	7.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	7.2	7.4
Pooled equity fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	55.5	47.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	55.5	47.8
Other
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.3	1.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	1.3	1.4
US Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	227.7	264.6
Target Allocation (as a percent)	38.00%	20.00%
Percentage of Assets	36.00%	40.00%
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	264.6
Fair value of plan assets, end of year	227.7	264.6
Western assets total return funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	85.5
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	85.5
Blackrock Investments Institutional Member
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	70.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	70.8
Pimco total return, institutional
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		199.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		199.4
Other fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	71.4	65.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	71.4	65.2
International equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	81.5	91.9
Target Allocation (as a percent)		20.00%
Percentage of Assets	13.00%	14.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	81.5	91.9
Euro Pacific Growth fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	35.4	29.1
Percentage of Assets	6.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	35.4	29.1
Emerging market index funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		62.8
Target Allocation (as a percent)		5.00%
Percentage of Assets		10.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		62.8
International securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	123.1
Target Allocation (as a percent)	18.00%
Percentage of Assets	19.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	123.1
Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	6.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	6.2
Long-biased hedge fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	0.2	6.7
Target Allocation (as a percent)	3.00%	10.00%
Percentage of Assets		1.00%
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	6.7
Fair value of plan assets, end of year	0.2	6.7
Real estate partnership
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.2	1.1
Target Allocation (as a percent)		2.00%
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	1.2	1.1
Level 1
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	124.4	297.7
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	124.4	297.7
Level 1 | U.S. equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	79.0	61.3
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	79.0	61.3
Level 1 | Consumer Discretionary Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	4.3	6.6
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	4.3	6.6
Level 1 | Consumer Staples Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	6.1	9.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	6.1	9.2
Level 1 | Energy Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.3	1.3
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	1.3	1.3
Level 1 | Finance Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	2.3	3.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	2.3	3.8
Level 1 | Health Care Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	9.9	8.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	9.9	8.4
Level 1 | Industrials Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	3.5	2.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	3.5	2.8
Level 1 | Information Technology Sector
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	3.7	7.3
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	3.7	7.3
Level 1 | Capital appreciation mutual fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	39.4	13.1
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	39.4	13.1
Level 1 | Small cap growth mutual fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	7.2	7.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	7.2	7.4
Level 1 | Other
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.3	1.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	1.3	1.4
Level 1 | US Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		202.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		202.2
Level 1 | Pimco total return, institutional
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		199.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		199.4
Level 1 | Other fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		2.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		2.8
Level 1 | International equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	8.0	34.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	8.0	34.2
Level 1 | Euro Pacific Growth fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	35.4	29.1
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	35.4	29.1
Level 1 | Emerging market index funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		5.1
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		5.1
Level 1 | International securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	45.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	45.4
Level 1 | Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	2.0
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	2.0
Level 2
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	503.2	267.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	503.2	267.2
Level 2 | Short-term investment fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	10.2	5.7
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	10.2	5.7
Level 2 | U.S. equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	196.8	141.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	196.8	141.4
Level 2 | Index funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	141.3	93.6
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	141.3	93.6
Level 2 | Pooled equity fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	55.5	47.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	55.5	47.8
Level 2 | US Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	227.7	62.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	227.7	62.4
Level 2 | Western assets total return funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	85.5
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	85.5
Level 2 | Blackrock Investments Institutional Member
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	70.8
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	70.8
Level 2 | Other fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	71.4	62.4
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	71.4	62.4
Level 2 | International equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	68.5	57.7
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	68.5	57.7
Level 2 | Emerging market index funds
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)		57.7
Roll-forward of Level 3 investments
Fair value of plan assets, end of year		57.7
Level 2 | International securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	68.5
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	68.5
Level 3
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	10.6	94.5
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	10.6	94.5
Level 3 | Receivables
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	86.7
Collection of receivables	(86.2)
Realized loss on plan assets	(0.5)
Level 3 | International equity securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	5.0
Roll-forward of Level 3 investments
Purchases or transfers to Level 3	5.0
Fair value of plan assets, end of year	5.0
Level 3 | International securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	9.2
Roll-forward of Level 3 investments
Fair value of plan assets, end of year	9.2
Level 3 | Fixed income securities
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	4.2
Roll-forward of Level 3 investments
Purchases or transfers to Level 3	4.2
Fair value of plan assets, end of year	4.2
Level 3 | Long-biased hedge fund
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	0.2
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	6.7
Purchases or transfers to Level 3	0.4
Sale of assets or transfers from Level 3	(6.9)
Fair value of plan assets, end of year	0.2
Level 3 | Real estate partnership
Summary of the Plan's investments measured at fair value and the target and current allocation, by level within the fair value hierarchy
Fair value of plan assets (in dollars)	1.2
Roll-forward of Level 3 investments
Fair value of plan assets, beginning of year	1.1
Unrealized gain on plan assets	0.1
Fair value of plan assets, end of year	$ 1.2