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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
 
 
Quarter Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
Salaried VEBA and defined benefit pension plan:
 
 
 
 
 
 
 
 
Beginning balance
 
$
(35.4
)
 
$
(29.8
)
 
$
(37.1
)
 
$
(31.3
)
Amortization of net actuarial loss1
 
0.2

 
0.1

 
0.6

 
0.3

Amortization of prior service cost1
 
1.2

 
1.0

 
3.6

 
3.0

Less: income tax expense2
 
(0.5
)
 
(0.4
)
 
(1.6
)
 
(1.2
)
Net amortization reclassified from AOCI to Net income
 
0.9

 
0.7

 
2.6

 
2.1

Translation impact on Canadian pension plan AOCI balance
 
(0.1
)
 
—

 
(0.1
)
 
0.1

Other comprehensive income, net of tax
 
0.8

 
0.7

 
2.5

 
2.2

Ending balance
 
$
(34.6
)
 
$
(29.1
)
 
$
(34.6
)
 
$
(29.1
)
 
 
 
 
 
 
 
 
 
Available for sale securities:
 
 
 
 
 
 
 
 
Beginning balance
 
$
1.1

 
$
0.2

 
$
0.8

 
$
(0.1
)
Unrealized gain on available for sale securities
 
1.0

 
0.9

 
3.1

 
1.3

Less: income tax expense
 
(0.4
)
 
(0.4
)
 
(1.2
)
 
(0.5
)
Net unrealized gain on available for sale securities
 
0.6

 
0.5

 
1.9

 
0.8

Reclassification of unrealized gain upon sale of available for sale securities3
 
(0.5
)
 
(0.3
)
 
(2.1
)
 
(0.3
)
Less: income tax benefit2
 
0.2

 
0.1

 
0.8

 
0.1

Net unrealized gain reclassified from AOCI to Net income
 
(0.3
)
 
(0.2
)
 
(1.3
)
 
(0.2
)
Other comprehensive income, net of tax
 
0.3

 
0.3

 
0.6

 
0.6

Ending balance
 
$
1.4

 
$
0.5

 
$
1.4

 
$
0.5

 
 
 
 
 
 
 
 
 
Other:
 
 
 
 
 
 
 
 
Beginning balance
 
$
—

 
$
(0.3
)
 
$
(0.4
)
 
$
(0.3
)
Unrealized gain
 
1.1

 
0.1

 
1.4

 
0.2

Less: income tax expense
 
(0.4
)
 
—

 
(0.5
)
 
(0.1
)
Net gain
 
0.7

 
0.1

 
0.9

 
0.1

Gain reclassified from AOCI to Net income
 
(0.3
)
 
—

 
—

 
—

Less: income tax benefit2
 
0.1

 
—

 
—

 
—

Net gain reclassified from AOCI to Net income
 
(0.2
)
 
—

 
—

 
—

Other comprehensive income, net of tax
 
0.5

 
0.1

 
0.9

 
0.1

Ending balance
 
$
0.5

 
$
(0.2
)
 
$
0.5

 
$
(0.2
)
 
 
 
 
 
 
 
 
 
Total AOCI ending balance
 
$
(32.7
)
 
$
(28.8
)
 
$
(32.7
)
 
$
(28.8
)
________________
1 
Amounts reclassified out of AOCI relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.
2 
Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
3 
Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.