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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Statutory rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
State taxes
1.8

 
1.5

 
1.8

 
1.5

Changes in state tax laws
2.0

 
0.1

 
1.2

 
—

Noncontrolling interest in partially-owned subsidiaries
(0.2
)
 
(0.7
)
 
(0.1
)
 
(0.6
)
Changes in valuation allowance and reserves
0.2

 
0.2

 
1.0

 
0.2

Settlements with tax authorities
—

 
—

 
—

 
(3.5
)
Equity compensation
(3.3
)
 
3.0

 
(2.1
)
 
1.5

Other, net
2.4

 
1.8

 
2.0

 
1.4

Effective rate
23.9
 %
 
40.9
 %
 
24.8
 %
 
35.5
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the six months ended June 30, 2018 and 2017 was as follows:
 
Six Months Ended
June 30,
 
2018
 
2017
 
(in millions)
Beginning balance
$
8.2

 
$
28.2

Additions for tax positions of prior years
1.6

 
0.1

Settlements
(1.5
)
 
(23.3
)
Ending balance
$
8.3

 
$
5.0