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Income Taxes (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.3

 
1.2

 
1.2

 
1.2

Domestic production activities deduction
—

 
(1.7
)
 
—

 
(1.8
)
Noncontrolling interest in partially-owned subsidiaries
(0.8
)
 
(0.9
)
 
(1.0
)
 
(0.9
)
State adjustments
—

 
—

 
—

 
0.1

Other, net
0.3

 
—

 
0.4

 
0.1

Effective rate
35.8
 %
 
33.6
 %
 
35.6
 %
 
33.7
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the nine months ended September 30, 2016 and 2015 was as follows:
 
Nine Months Ended
September 30,
 
2016
 
2015
 
(in millions)
Beginning balance
$
65.2

 
$
62.3

Additions for tax positions related to the current year
4.6

 
4.1

Additions for tax positions of prior years
1.0

 
—

Reductions for tax positions of prior years
—

 
(0.1
)
Settlements
—

 
(0.7
)
Expiration of statute of limitations
(0.1
)
 
—

Ending balance
$
70.7

 
$
65.6