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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Reconciliation of Unrecognized Tax Benefits
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, 2017
$
0.3

 
$

Gross amount of increases in unrecognized tax benefits related to prior periods
0.8

 
0.1

Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations
(0.2
)


Balance at September 30, 2018
$
0.9

 
$
0.1