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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax
Changes in accumulated other comprehensive loss, net of tax, for the years ended Dec. 31, 2018 and 2017:
 
 
Gains and Losses on Cash Flow Hedges
(Millions of Dollars)
 
2018
 
2017
Accumulated other comprehensive loss at Jan. 1
 
$
(0.1
)
 
$
(0.1
)
Losses reclassified from net accumulated other comprehensive loss (net of taxes of $0 and $0), respectively (a)
 
0.1

 
—

Net current period other comprehensive income
 
0.1

 
—

Accumulated other comprehensive loss at Dec. 31
 
$
—

 
$
(0.1
)
Reclassifications out of Accumulated Other Comprehensive Loss

(a) 
Included in interest charges.