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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Components of accumulated other comprehensive income (loss), net of tax
The components of changes in accumulated comprehensive income (loss), net of tax, were as follows:
(millions)
Foreign
Currency
Translation
Adjustments
 
Effective Portion
of Unrealized
Gain (Loss) on
Derivative
 
Total
Accumulated
Other
Comprehensive
Income (Loss)
Balance as of December 31, 2014
$
(0.5
)
 
$
0.3

 
$
(0.2
)
Change in other comprehensive income (loss)
(0.7
)
 
(0.2
)
 
(0.9
)
Balance as of December 31, 2015
(1.2
)
 
0.1

 
(1.1
)
Change in other comprehensive income (loss)
(0.2
)
 
(0.1
)
 
(0.3
)
Balance as of December 31, 2016
(1.4
)
 
—

 
(1.4
)
Change in other comprehensive income (loss)
0.2

 
—

 
0.2

Balance as of December 31, 2017
$
(1.2
)
 
$
—

 
$
(1.2
)

Note: Amounts may not foot due to rounding.