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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Reconciliation of Unrecognized Tax Benefits
A reconciliation of the amount of unrecognized tax benefit is as follows:
(Millions of Dollars)
 
June 30, 2014
 
Dec. 31, 2013
Unrecognized tax benefit — Permanent tax positions
 
$
0.1

 
$
0.1

Unrecognized tax benefit — Temporary tax positions
 
1.7

 
1.4

Total unrecognized tax benefit
 
$
1.8

 
$
1.5

Tax Benefits Associated with NOL and Tax Credit Carryforwards
The unrecognized tax benefit amounts were reduced by the tax benefits associated with net operating loss (NOL) and tax credit carryforwards. The amounts of tax benefits associated with NOL and tax credit carryforwards are as follows:
(Millions of Dollars)
 
June 30, 2014
 
Dec. 31, 2013
NOL and tax credit carryforwards
 
$
(0.4
)
 
$
(0.4
)