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Accumulated Other Comprehensive (Loss) Income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
 
 
Quarter Ended
 
 
March 31,
 
 
2018
 
2017
Defined Benefit Pension Plan and Salaried VEBA:
 
 
 
 
Beginning balance
 
$
(38.5
)
 
$
(37.1
)
Amortization of net actuarial loss1
 
0.2

 
0.2

Amortization of prior service cost1
 
1.3

 
1.2

Less: income tax expense2
 
(0.3
)
 
(0.5
)
Net amortization reclassified from AOCI to Net income
 
1.2

 
0.9

Other comprehensive income, net of tax
 
1.2

 
0.9

Ending balance
 
$
(37.3
)
 
$
(36.2
)
 
 
 
 
 
Available for Sale Securities:
 
 
 
 
Beginning balance
 
$
0.9

 
$
0.8

Unrealized gain on available for sale securities
 
1.0

 
1.1

Less: income tax expense
 
(0.2
)
 
(0.4
)
Net unrealized gain on available for sale securities
 
0.8

 
0.7

Reclassification of unrealized gain upon sale of available for sale securities3
 
(1.5
)
 
(0.9
)
Less: income tax benefit2
 
0.5

 
0.3

Net gain reclassified from AOCI to Net income
 
(1.0
)
 
(0.6
)
Other comprehensive (loss) income, net of tax
 
(0.2
)
 
0.1

Ending balance
 
$
0.7

 
$
0.9

 
 
 
 
 
Cash Flow Hedges:
 
 
 
 
Beginning balance
 
$
0.5

 
$
(0.2
)
Unrealized (loss) gain on cash flow hedges
 
(12.2
)
 
0.3

Less: income tax benefit (expense)
 
3.0

 
(0.1
)
Net unrealized (loss) gain on cash flow hedges
 
(9.2
)
 
0.2

Reclassification of unrealized (gain) loss upon settlement of cash flow hedges4
 
(0.1
)
 
0.2

Less: income tax expense2
 
—

 
(0.1
)
Net (gain) loss reclassified from AOCI to Net income
 
(0.1
)
 
0.1

Other comprehensive (loss) income, net of tax
 
(9.3
)
 
0.3

Ending balance
 
$
(8.8
)
 
$
0.1

 
 
 
 
 
Foreign Currency Translation:
 
 
 
 
Beginning balance
 
$
—

 
$
(0.2
)
Other comprehensive income, net of tax
 
—

 
—

Ending balance
 
$
—

 
$
(0.2
)
 
 
 
 
 
Total AOCI ending balance
 
$
(45.4
)
 
$
(35.4
)
____________________
1 
Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other income, net, 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, net. We use the specific identification method to determine the amount reclassified out of AOCI.