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Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of accumulated comprehensive income (loss), net of tax The components of changes in accumulated comprehensive loss, for the three months ended March 31, 2020 were as follows:
 (millions) (unaudited)
Foreign Currency
Translation
Adjustments
 
Effective Portion of
Unrealized Loss on 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Loss
Balance as of December 31, 2019
$
(2.3
)
 
$
(0.4
)
 
$
(2.7
)
Change in other comprehensive loss
(0.2
)
 
(2.8
)
 
(3.0
)
Balance as of March 31, 2020
$
(2.5
)
 
$
(3.2
)
 
$
(5.7
)