Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Summary of Components of AOCI

Accumulated other comprehensive income (loss) includes the cumulative gains and losses of derivative instruments that qualify as cash flow hedges. The following table provides a rollforward of accumulated other comprehensive income (loss) for the years ended December 31, 2016 and 2015 (in millions):

 

 

2016

 

 

2015

 

Accumulated other comprehensive income (loss) as of January 1,

$

(4.2

)

 

$

(2.2

)

Other comprehensive income (loss)

 

1.9

 

 

 

(3.2

)

Income tax benefit (expense)

 

(0.7

)

 

 

1.2

 

Other comprehensive income (loss), net of tax

 

1.2

 

 

 

(2.0

)

Accumulated other comprehensive income (loss) as of December 31,

$

(3.0

)

 

$

(4.2

)