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Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Gain (Loss)

Accumulated Other Comprehensive Loss

 

Accumulated Other Comprehensive Loss for the three months ended June 30, 2018 and 2017, respectively, consisted of:

 

 

 

As of March 31,

 

 

Adoption of

new accounting

 

 

Three Months Ended  June 30,

 

 

As of June 30,

 

 

As of March 31,

 

 

Three Months Ended  June 30,

 

 

As of June 30,

 

 

 

2018

 

 

standard

 

 

2018

 

 

2018

 

 

2017

 

 

2017

 

 

2017

 

(Millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gain on revaluation of defined benefit plans,

   net of income tax expense of $0.2 for 2018

 

$

(14

)

 

$

—

 

 

$

1

 

 

$

(13

)

 

$

(14

)

 

$

—

 

 

$

(14

)

Loss for nonqualified pension plans

 

 

(7

)

 

 

—

 

 

 

—

 

 

 

(7

)

 

 

(7

)

 

 

—

 

 

 

(7

)

Unrealized loss during period on derivatives

   qualifying as cash flow hedges, net of income tax

   (benefit) of $(1.5) for 2018

 

 

30

 

 

 

—

 

 

 

(5

)

 

 

25

 

 

 

7

 

 

 

—

 

 

 

7

 

Reclassification to net income of gains on

   cash flow hedges, net of income tax (benefit)

   of $(0.1) for 2017(a)

 

 

(66

)

 

 

—

 

 

 

—

 

 

 

(66

)

 

 

(47

)

 

 

(1

)

 

 

(48

)

Loss on derivatives qualifying as cash flow

   hedges

 

 

(36

)

 

 

—

 

 

 

(5

)

 

 

(41

)

 

 

(40

)

 

 

(1

)

 

 

(41

)

Accumulated Other Comprehensive Loss

 

$

(57

)

 

$

—

 

 

$

(4

)

 

$

(61

)

 

$

(61

)

 

$

(1

)

 

$

(62

)

 

Accumulated Other Comprehensive (Loss) Gain for the six months ended June 30, 2018 and 2017, respectively, consisted of:

 

 

 

As of December 31,

 

 

Adoption of

new accounting

 

 

Six Months Ended June 30,

 

 

As of June 30,

 

 

As of December 31,

 

 

Six Months Ended June 30,

 

 

As of June 30,

 

 

 

2017

 

 

standard

 

 

2018

 

 

2018

 

 

2016

 

 

2017

 

 

2017

 

(Millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gain on revaluation of defined benefit plans

   net of tax expense of $0.2 for 2018

 

$

(14

)

 

$

—

 

 

$

1

 

 

$

(13

)

 

$

(14

)

 

$

—

 

 

$

(14

)

Loss for nonqualified pension plans

 

 

(6

)

 

 

(1

)

 

 

—

 

 

 

(7

)

 

 

(7

)

 

 

—

 

 

 

(7

)

Unrealized (loss) gain during period on derivatives

   qualifying as cash flow hedges, net of income tax

   (benefit)expense of $(1.5) for 2018 and $1.1 for

   2017

 

 

30

 

 

 

—

 

 

 

(5

)

 

 

25

 

 

 

5

 

 

 

2

 

 

 

7

 

Reclassification to net income of (gains) losses on

   cash flow hedges, net of income tax (benefit)

   expense of $(7.2) for 2018 and $13.5 for 2017(a)

 

 

(56

)

 

 

—

 

 

 

(10

)

 

 

(66

)

 

 

(70

)

 

 

22

 

 

 

(48

)

(Loss) gain on derivatives qualifying as cash flow

   hedges

 

 

(26

)

 

 

—

 

 

 

(15

)

 

 

(41

)

 

 

(65

)

 

 

24

 

 

 

(41

)

Accumulated Other Comprehensive (Loss) Gain

 

$

(46

)

 

$

(1

)

 

$

(14

)

 

$

(61

)

 

$

(86

)

 

$

24

 

 

$

(62

)

 

(a)

Reclassification is reflected in the operating expenses line item in the condensed consolidated statements of income.