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Income Taxes (Tables)
6 Months Ended
Jun. 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

Balance at June 30, 2018
$
1.1

 
$
0.1