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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
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
Balance at December 31, 2016
$
2.8

Gross amount of decreases in unrecognized tax benefits related to prior periods
(0.4
)
Decreases in unrecognized tax benefits relating to settlements with taxing authorities
(2.1
)
Balance at September 30, 2017
$
0.3