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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.2

 
1.2

 
1.1

 
1.2

Domestic production activities deduction
—

 
(1.8
)
 
—

 
(1.9
)
Noncontrolling interest in partially-owned subsidiaries
(1.0
)
 
(0.9
)
 
(1.1
)
 
(0.9
)
Other, net
(0.1
)
 
0.3

 
0.5

 
0.3

Effective rate
35.1
 %
 
33.8
 %
 
35.5
 %
 
33.7
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the six months ended June 30, 2016 and 2015 was as follows:
 
Six Months Ended
June 30,
 
2016
 
2015
 
(in millions)
Beginning balance
$
65.2

 
$
62.3

Additions for tax positions related to the current year
3.0

 
2.7

Additions for tax positions of prior years
1.0

 
—

Reductions for tax positions of prior years
(0.1
)
 
(0.1
)
Settlements
—

 
(0.2
)
Ending balance
$
69.1

 
$
64.7