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EMPLOYEE BENEFIT PLANS (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Expected federal subsidies which will partially offset other postretirement benefits
2014	$ (0.9)
2015	(1.0)
2016	(1.0)
2017	(1.0)
2018	(1.1)
2019 through 2023	(6.0)
Defined Contribution Benefit Plans
Total costs incurred for defined contribution benefit plans	8.2	5.5	5.0
Deferred compensation plans
Deferred compensation obligation classified as an equity instrument	8.0	8.1
Deferred compensation obligation associated with deferrals that allow for distribution in cash	15.1	14.9
Costs incurred under deferred compensation arrangement	1.5	1.1	0.5
Pension Benefits
Employee Benefit Plans
Expected contributions to the plans during the next fiscal year	47.3
Expected payments, reflecting expected future service
2014	40.6
2015	40.8
2016	42.0
2017	43.9
2018	44.0
2019 through 2023	228.2
Other Benefits
Employee Benefit Plans
Expected contributions to the plans during the next fiscal year	3.9
Expected payments, reflecting expected future service
2014	12.7
2015	13.5
2016	14.4
2017	15.4
2018	16.4
2019 through 2023	$ 95.1