Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Reconciliation between the statutory U.S. Federal income tax rate and the Company's effective income tax rate on income before income taxes

The following is a reconciliation between the statutory U.S. federal income tax rate and the Company’s effective income tax rate on income before income taxes:

	Three Months Ended March 31,
	2018		2017
Statutory rate	21.0	%	35.0	%
State taxes	1.8		1.4
Noncontrolling interest in partially-owned subsidiaries	—		(0.4	)
Changes in valuation allowance and reserves	3.2		0.2
Settlements with tax authorities	—		(8.0	)
Other, net	0.2		0.5
Effective rate	26.2	%	28.7	%

Change in unrecognized tax benefits

The change in unrecognized tax benefits for the three months endedMarch 31, 2018 and 2017 was as follows:

	Three Months Ended March 31,
	2018		2017
	(in millions)
Beginning balance	$	8.2	$	28.2
Additions for tax positions of prior years	1.6		0.1
Settlements	—		(23.3		)
Ending balance	$	9.8	$	5.0