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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.2

 
0.9

 
1.2

 
0.9

Domestic production activities deduction
(1.8
)
 
(2.2
)
 
(1.9
)
 
(2.2
)
Noncontrolling interest in partially-owned subsidiaries
(0.9
)
 
(1.1
)
 
(0.9
)
 
(1.2
)
Other, net
0.3

 
—

 
0.3

 
0.1

Effective rate
33.8
 %
 
32.6
 %
 
33.7
 %
 
32.6
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the six months ended June 30, 2015 and 2014 was as follows:
 
Six Months Ended
June 30,
 
2015
 
2014
 
(in millions)
Beginning balance
$
62.3

 
$
55.0

Additions for tax positions related to the current year
2.7

 
2.6

Reductions for tax positions of prior years
(0.1
)
 
(0.1
)
Settlements
(0.2
)
 
—

Ending balance
$
64.7

 
$
57.5