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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive income (loss) is comprised of unrealized gains (losses) on cash flow hedges and foreign currency translation adjustments. The components of changes in accumulated comprehensive income (loss), net of tax, were as follows:
(millions)
Foreign
Currency
Translation
Adjustments
 
Effective Portion
of Unrealized
Loss on
Derivative
 
Total
Accumulated
Other
Comprehensive
Income (Loss)
Balance as of December 31, 2016
$
(1.4
)
 
$
—

 
$
(1.4
)
Change in other comprehensive income
0.2

 
—

 
0.2

Balance as of December 31, 2017
(1.2
)
 
—

 
(1.2
)
Change in other comprehensive loss
(0.6
)
 
—

 
(0.6
)
Cumulative effect of change in accounting principle (1)
(0.6
)
 
—

 
(0.6
)
Balance as of December 31, 2018
(2.4
)
 
—

 
(2.4
)
Change in other comprehensive income (loss)
0.1

 
(0.4
)
 
(0.3
)
Balance as of December 31, 2019
$
(2.3
)
 
$
(0.4
)
 
$
(2.7
)

(1) Refer to Note 1, Significant Accounting Policies and Practices for additional information on the Company's adoption of ASU 2018-02.