INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2013

INCOME TAXES

Schedule of income tax expense on income from continuing operations

The income tax expense on income from continuing operations for each of the three years in the period ended December 31, 2013 consisted of the following (in millions):

	Years Ended December 31,
	2013			2012			2011
Current:
Federal	$	(24.3	)	$	38.9		$	26.5
State	(1.0		)	3.2			1.8
Total	(25.3		)	42.1			28.3
Deferred	57.5			(9.1		)	(3.2		)
Provision for income taxes	$	32.2		$	33.0		$	25.1

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,
	2013		2012		2011
Computed federal income tax expense	35.0	%	35.0	%	35.0	%
Discontinued operations	0.0	%	(0.2	)%	(0.1	)%
State income tax	2.9	%	0.6	%	2.1	%
Deferred tax adjustment	0.0	%	(1.6	)%	0.0	%
Separation costs	0.0	%	2.0	%	0.0	%
Unrecognized tax benefits	(2.1	)%	1.7	%	0.0	%
Other — net	1.7	%	1.3	%	(1.6	)%
Provision for income taxes	37.5	%	38.8	%	35.4	%

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

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31 of each year are as follows (in millions):

	As of December 31,
	2013			2012
Deferred tax assets:
Benefit plans	$	41.8		$	54.0
Insurance reserves	10.0			9.7
Allowance for doubtful accounts	1.3			1.7
Reserves	6.0			1.7
Foreign losses and unremitted earnings	3.1			—
Alternative minimum tax credits	1.4			—
Other	(0.2		)	0.3
Total deferred tax assets	63.4			67.4
Deferred tax liabilities:
Basis differences for property and equipment	278.0			292.6
Capital Construction Fund	83.4			3.3
Joint ventures and other investments	4.6			3.8
Deferred revenue	11.4			10.9
Amortization	3.0			2.1
Total deferred tax liabilities	380.4			312.7
Net deferred tax liability	$	317.0		$	245.3

Reconciliation of unrecognized tax benefits

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in millions):

Balance at December 31, 2010	$	3.5
Additions for tax positions of prior years	0.3
Additions for tax positions of current year	(0.5		)
Reductions for lapse of statute of limitations	(0.7		)
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