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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Reconciliation between the statutory United States Federal income tax rate and the Company's effective income tax rate from continuing operations
The following is a reconciliation between the statutory U.S. Federal income tax rate and the Company’s effective income tax rate on income from continuing operations:
 
Three Months Ended
March 31,
 
2015
 
2014
Statutory rate
35.0
 %
 
35.0
 %
State taxes
1.2

 
0.9

Domestic production activities deduction
(2.1
)
 
(2.2
)
Noncontrolling interest in partially-owned subsidiaries
(1.0
)
 
(1.2
)
Other, net
0.4

 
0.1

Effective rate
33.5
 %
 
32.6
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the three months ended March 31, 2015 and 2014 was as follows:
 
Three Months Ended
March 31,
 
2015
 
2014
 
(in millions)
Beginning balance
$
62.3

 
$
55.0

Additions for tax positions related to the current year
1.3

 
1.2

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

Ending balance
$
63.3

 
$
56.1