BENEFIT PLANS (Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Private Equity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance at December 31, 2013	$ 38.7
Return on plan assets:
Unrealized	0.6
Realized	3.1
Purchases	9.3
Sales	(16.0)
Balance at December 31, 2014	35.7
Hedge Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance at December 31, 2013	82.9
Return on plan assets:
Unrealized	2.6
Realized	1.2
Purchases	0
Sales	(17.0)
Balance at December 31, 2014	69.7
Real Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance at December 31, 2013	12.2
Return on plan assets:
Unrealized	2.0
Realized	0
Purchases	2.8
Sales	(0.5)
Balance at December 31, 2014	$ 16.5