Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense (benefit) consists of the following (in millions):

	Year ended December 31,
	2018			2017			2016
Current:
Federal	$	35.0		$	10.4		$	15.3
State	9.4			5.3			6.0
Foreign	0.8			0.9			1.0
Total current	45.2			16.6			22.3
Deferred:
Federal	(2.3		)	(87.5		)	5.0
State	(5.2		)	9.1			(1.1		)
Foreign	—			—			(0.4		)
Total deferred	(7.5		)	(78.4		)	3.5
Total income tax expense (benefit)	$	37.7		$	(61.8	)	$	25.8

Reconciliation of the Federal Statutory Rate to Effective Tax Rate

A reconciliation of our federal statutory income tax rate to our effective income tax rate is as follows:

	Year ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
State income taxes, net of federal benefit	5.0		2.9		2.0
Noncontrolling interests	—		(13.7	)	(19.2	)
Tax credits	(1.8	)	(0.6	)	(0.6	)
Transaction costs	—		1.4		—
Domestic production activities deduction	—		(0.5	)	(1.1	)
Effect of Tax Reform Act	—		(57.6	)	—
Restricted share vesting	(1.0	)	(0.5	)	—
Effect of deferred revaluation related to lower blended state tax rate	(2.0	)	—		—
Prior year return to provision adjustments	(2.8	)	—		—
Other	(0.1	)	1.5		0.1
Effective tax rate	18.3	%	(32.1	)%	16.2	%

Schedule of Deferred Tax Assets and Liabilities

The significant components of deferred tax assets and liabilities consist of the following (in millions):

	December 31,
	2018			2017
Deferred tax assets:
Deferred revenues	$	14.8		$	26.7
Net operating loss carryovers	0.7			1.3
Equity-based compensation	9.2			3.9
Other	10.7			8.9
Total deferred tax assets	35.4			40.8
Deferred tax liabilities:
Goodwill and other intangibles	(178.9		)	(193.8		)
Deferred contract costs	(41.9		)	(36.2		)
Property, equipment and computer software	(28.0		)	(26.1		)
Other	(7.5		)	(9.3		)
Total deferred tax liabilities	(256.3		)	(265.4		)
Net deferred tax liability	$	(220.9	)	$	(224.6	)

Schedule of Unrecognized Tax Benefits Roll Forward

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

	December 31,
	2018			2017
Balance, January 1	$	8.3		$	—
Additions based on tax positions of prior years	0.4			8.3
Decreases based on tax positions of prior years	(8.3		)	—
Balance, December 31	$	0.4		$	8.3