INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2014

INCOME TAXES.

Schedule of income tax expense on income from continuing operations

	Years Ended December 31,
	2014		2013			2012
Current:
Federal	$	45.5	$	(24.3	)	$	38.9
State	3.7		(1.0		)	3.2
Total	49.2		(25.3		)	42.1
Deferred	2.7		57.5			(9.1		)
Total income tax expense	$	51.9	$	32.2		$	33.0

Schedule of reasons why income tax expense differs from amounts computed by applying the statutory federal rate to income from continuing operations

	Years Ended December 31,
	2014		2013		2012
Computed federal income tax expense	35.0%		35.0%		35.0%
State income tax	2.2%		2.9%		0.6%
Deferred tax adjustment	(0.9%	)	0.0%		(1.6%	)
Separation costs	0.0%		0.0%		2.0%
Transaction costs	1.4%		0.0%		0.0%
Unrecognized tax benefits	(0.4%	)	(2.1%	)	1.7%
Valuation allowance	3.3%		0.0%		0.0%
Other — net	1.7%		1.7%		1.1%
Effective income tax rate	42.3%		37.5%		38.8%

Schedule of tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities

	As of December 31,
	2014			2013
Deferred tax assets:
Benefit plans	$	63.6		$	41.8
Insurance reserves	11.4			10.0
Allowance for doubtful accounts	1.4			1.3
Reserves	2.1			6.0
Foreign losses	4.1			3.1
Alternative minimum tax credits	1.5			1.4
Other	0.8			(0.2		)
Total deferred tax assets	84.9			63.4
Valuation allowance	(4.1		)	—
Total Deferred tax assets, net of valuation allowance	80.8			63.4
Deferred tax liabilities:
Basis differences for property and equipment	252.7			278.0
Capital Construction Fund	106.9			83.4
Joint ventures and other investments	7.7			4.6
Deferred revenue	10.1			11.4
Amortization	3.8			3.0
Total deferred tax liabilities	381.2			380.4
Deferred tax liability, net	$	300.4		$	317.0

Reconciliation of unrecognized tax benefits

Balance at December 31, 2011	$	2.6
Additions for tax positions of prior years	4.0
Reductions for tax positions of current year	3.7
Reductions for tax positions of prior years	(1.0		)
Reductions for lapse of statute of limitations	(1.0		)
Balance at December 31, 2012	8.3
Additions for tax positions of prior years	2.0
Reductions for lapse of statute of limitations	(3.1		)
Balance at December 31, 2013	7.2
Additions for tax positions of prior years	0.5
Reductions for lapse of statute of limitations	(1.0		)
Balance at December 31, 2014	$	6.7