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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2015
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
Balance at December 31, 2014
$
0.9

Gross amount of increases in unrecognized tax benefits related to prior periods
1.5

Balance at March 31, 2015
$
2.4