ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

9 Months Ended

Sep. 30, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of changes in accumulated other comprehensive loss by component, net of tax

Changes in accumulated other comprehensive loss by component, net of tax, for the nine months ended September 30, 2017 were as follows:

									Accumulated
					Non-				Other
			Post		Qualified				Comprehensive
(In millions)	Pensions		Retirement		Plans		Other		Income (Loss)
Balance at December 31, 2016	$	(41.4)	$	18.1	$	(0.4)	$	0.1	$	(23.6)
Amortization of prior service cost		(0.4)		—		—		—		(0.4)
Amortization of net loss		0.8		0.1		—		—		0.9
Other adjustments		—		—		—		0.2		0.2
Balance at March 31, 2017		(41.0)		18.2		(0.4)		0.3		(22.9)
Net gain in prior service costs		—		—		—		0.1		0.1
Amortization of prior service cost		(0.3)		—		—		—		(0.3)
Amortization of net loss		0.8		0.3		0.1		—		1.2
Balance at June 30, 2017		(40.5)		18.5		(0.3)		0.4		(21.9)
Net gain in prior service costs		—		0.7		—		—		0.7
Amortization of prior service cost		(0.4)		(1.7)		(0.1)		—		(2.2)
Amortization of net loss		0.8		0.2		—		—		1.0
Balance at September 30, 2017	$	(40.1)	$	17.7	$	(0.4)	$	0.4	$	(22.4)

The balance for post-retirement at December 31, 2016 has been corrected for the adjustment described in Note 2, Immaterial Correction of an Error in Previously Issued Financial Statements.  

Changes in accumulated other comprehensive loss by component, net of tax, for the nine months ended September 30, 2016 were as follows:

									Accumulated
					Non-				Other
			Post		Qualified				Comprehensive
(In millions)	Pensions		Retirement		Plans		Other		Income (Loss)
Balance at December 31, 2015	$	(41.7)	$	(4.7)	$	(0.2)	$	(0.3)	$	(46.9)
Net gain in prior service costs		—		0.7		—		—		0.7
Amortization of prior service cost		(0.4)		—		—		—		(0.4)
Amortization of net loss		0.8		0.2		0.1		—		1.1
Other adjustments		—		—		—		(0.1)		(0.1)
Balance at March 31, 2016		(41.3)		(3.8)		(0.1)	$	(0.4)		(45.6)
Amortization of prior service cost		(0.3)		—		0.1		—		(0.2)
Amortization of net loss		0.8		0.2		—		—		1.0
Balance at June 30, 2016		(40.8)		(3.6)		—		(0.4)		(44.8)
Net gain in prior service costs		—		23.4		—		—		23.4
Amortization of prior service cost		(0.3)		(0.3)		—		—		(0.6)
Amortization of net loss (gain)		0.8		0.2		(0.1)		—		0.9
Other adjustments		—		—		—		0.6		0.6
Balance at September 30, 2016	$	(40.3)	$	19.7	$	(0.1)	$	0.2	$	(20.5)