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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Summary of Income Tax Contingencies
A reconciliation of the beginning and ending liability for unrecognized tax benefits is as follows (in millions):
 
Gross Unrecognized Income Tax Benefits
 
Accrued Interest and Penalties
Balance at December 31, 2013
$
1.1

 
$
0.3

Gross amount of increases in unrecognized tax benefits related to prior periods

 
0.1

Gross amount of decreases in unrecognized tax benefits related to prior periods
(0.7
)
 
(0.3
)
Balance at June 30, 2014
$
0.4

 
$
0.1