Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Provision for Income Taxes

Components of the provision for income taxes are as follows:

	Years Ended December 31,
(in millions)	2017			2016		2015
Current provision:
Federal	$	29.5		$	33.6	$	33.3
State and local	3.0			3.3		3.2
	32.5			36.9		36.5
Deferred (benefit) provision:
Federal	(53.0		)	12.7		6.0
State and local	0.8			1.1		2.1
Foreign	(0.2		)	—		—
	(52.4		)	13.8		8.1
	$	(19.9	)	$	50.7	$	44.6

Schedule of Income from Operations Before Provision for Income Taxes

Income from operations before provision for income taxes were as follows:

	Years Ended December 31,
(in millions)	2017		2016		2015
Domestic	$	102.2	$	146.4	$	114.1
Foreign	0.3		1.0		1.3
	$	102.5	$	147.4	$	115.4

Reconciliation of Amount Computed by Applying the Federal Statutory Income Tax Rate

Our income tax (benefit) expense is different from the amount computed by applying the federal statutory income tax rate to income before taxes as follows:

	Years Ended December 31,
(in millions)	2017			2016			2015
Federal statutory tax on earnings before income taxes	$	35.9		$	51.6		$	40.4
State income taxes, net of federal income tax benefit	2.5			4.0			2.0
Non-deductible officer's compensation	4.7			2.3			2.0
Change in enacted tax rates	(57.7		)	0.1			0.7
Windfall deduction from equity compensation	(5.2		)	(4.9		)	—
Other	(0.1		)	(2.4		)	(0.5		)
	$	(19.9	)	$	50.7		$	44.6

Schedule of Components Deferred Tax Assets and Liabilities

Components of our deferred tax assets and liabilities are as follows:

	As of December 31,
(in millions)	2017			2016
Deferred tax assets:
Deferred compensation plans	$	6.5		$	10.7
Deferred income	4.7			4.3
Allowance for uncollectible receivables	0.8			1.2
Deferred liabilities	2.1			3.0
Net operating losses and credit carryforward	5.1			8.1
Deferred tax assets	19.2			27.3
Valuation allowance	(0.2		)	(0.4		)
Net deferred tax asset	19.0			26.9
Deferred tax liabilities:
Intangible assets in excess of tax basis	29.2			41.2
Property and equipment in excess of tax basis	22.4			34.8
Equity investments in excess of tax basis	6.8			11.1
Other	1.2			3.0
Deferred tax liabilities	59.6			90.1
Net deferred tax liability	$	(40.6	)	$	(63.2	)

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

(in millions)	2017			2016			2015
Balance as of January 1	$	2.3		$	1.8		$	1.5
Additions for tax positions related to the current year	0.5			0.5			0.3
Additions for tax positions of prior years	0.3			0.1			0.2
Reductions for tax positions of prior years	(0.2		)	(0.1		)	(0.2		)
Balance as of December 31	$	2.9		$	2.3		$	1.8