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Comprehensive Income (Loss) (Notes)
 6 Months Ended
Jun. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Comprehensive Income (Loss)
Comprehensive Income (Loss)
 

Other comprehensive income (loss), net of tax, information is presented below:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Foreign currency translation
 
 
 
 
 
 
 
Balance at beginning of period
$
(0.6
)
 
$
(2.2
)
 
$
(2.1
)
 
$
1.0

Other comprehensive income (loss)—foreign currency translation gain (loss)
(1.1
)
 
1.2

 
0.4

 
(2.0
)
Balance at end of period
$
(1.7
)
 
$
(1.0
)
 
$
(1.7
)
 
$
(1.0
)
Cash flow hedges
 
 
 
 
 
 
 
Balance at beginning of period
$
(28.6
)
 
$
(32.3
)
 
$
(34.0
)
 
$
(32.2
)
Other comprehensive income (loss):
 
 
 
 
 
 
 
Gains (losses) arising in period
40.7

 
(1.5
)
 
32.9

 
(19.5
)
Income tax expense
2.9

 
—

 
2.9

 
—

Gains (losses) arising in period, net of tax
37.8

 
(1.5
)
 
30.0

 
(19.5
)
Reclassification of losses (gains) to net income (loss)—commodity contracts (a)
14.5

 
9.3

 
27.7

 
27.2

Income tax expense
2.3

 
—

 
2.3

 
—

Net amount of reclassification of losses (gains) to net income (loss)
12.2

 
9.3

 
25.4

 
27.2

Total other comprehensive income (loss), net of tax
50.0

 
7.8

 
55.4

 
7.7

Balance at end of period
$
21.4

 
$
(24.5
)
 
$
21.4

 
$
(24.5
)
Unrealized holding gains on securities
 
 
 
 
 
 
 
Balance at beginning and end of period
$
—

 
$
0.4

 
$
—

 
$
0.4

Pension and OPEB plans
 
 
 
 
 
 
 
Balance at beginning of period
$
(159.0
)
 
$
(180.5
)
 
$
(151.1
)
 
$
(173.6
)
Other comprehensive income (loss):
 
 
 
 
 
 
 
Reclassification to net income (loss):
 
 
 
 
 
 
 
Prior service costs (credits) (b)
(13.8
)
 
(15.0
)
 
(27.6
)
 
(30.1
)
Actuarial (gains) losses (b)
6.0

 
8.2

 
11.9

 
16.4

Subtotal
(7.8
)
 
(6.8
)
 
(15.7
)
 
(13.7
)
Income tax expense
(1.3
)
 
—

 
(1.3
)
 
—

Amount of reclassification to net income (loss), net of tax
(6.5
)
 
(6.8
)
 
(14.4
)
 
(13.7
)
Total other comprehensive income (loss), net of tax
(6.5
)
 
(6.8
)
 
(14.4
)
 
(13.7
)
Balance at end of period
$
(165.5
)
 
$
(187.3
)
 
$
(165.5
)
 
$
(187.3
)
(a)
Included in cost of products sold.
(b)
Included in pension and OPEB expense (income).