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Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Gain (Loss)
Accumulated Other Comprehensive Loss for the three months ended March 31, 2020 and 2019, respectively, consisted of:
 
 
As of December 31,
 
Three Months Ended March 31,
 
As of March 31,
 
As of December 31,
 
Adoption of new accounting
 
Three Months Ended March 31,
 
As of March 31,
 
 
2019
 
2020
 
2020
 
2018
 
standard
 
2019
 
2019
(Millions)
 
 

 
 

 
 

 
 

 
 
 
 

 
 

Change in revaluation of defined benefit plans
 
$
(12
)
 
$
—

 
$
(12
)
 
$
(11
)
 
$
(2
)
 
$
—

 
$
(13
)
Loss on nonqualified pension plans
 
(7
)
 
—

 
(7
)
 
(6
)
 
—

 
—

 
(6
)
Unrealized loss during period on derivatives qualifying as cash flow hedges, net of income tax benefit of $(8.5) for 2020 and $(10.9) for 2019
 
(13
)
 
(23
)
 
(36
)
 
9

 
—

 
(29
)
 
(20
)
Reclassification to net income of losses on cash flow hedges, net of income tax expense (benefit) of $0.3 for 2020 and $0.7 for 2019(a)
 
(63
)
 
2

 
(61
)
 
(64
)
 
(10
)
 
2

 
(72
)
Loss on derivatives qualifying as cash flow hedges
 
(76
)
 
(21
)
 
(97
)
 
(55
)
 
(10
)
 
(27
)
 
(92
)
Accumulated Other Comprehensive Loss
 
$
(95
)
 
$
(21
)
 
$
(116
)
 
$
(72
)
 
$
(12
)
 
$
(27
)
 
$
(111
)
(a)Reclassification is reflected in the operating expenses line item in our condensed consolidated statements of income.