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Postretirement Benefits Other Than Pensions (Tables) - Other Postretirement Benefit Plan, Defined Benefit [Member]
 12 Months Ended
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Changes in Fair Value of Plan Assets and Changes in Accumulated Postretirement Benefit Obligation for the years ended December 31, 2016 and 2015 were:
DOLLARS IN MILLIONS
 
 
2016
 
2015
Fair Value of Plan Assets at Beginning of Year
 
$
—

 
$
—

Employer Contributions
 
3.4

 
3.4

Plan Participants’ Contributions
 
1.0

 
1.2

Benefits Paid
 
(4.4
)
 
(4.6
)
Fair Value of Plan Assets at End of Year
 
—

 
—

Accumulated Postretirement Benefit Obligation at Beginning of Year
 
29.6

 
31.1

Service Cost
 
0.1

 
0.2

Interest Cost
 
0.8

 
1.0

Plan Participants’ Contributions
 
1.0

 
1.2

Benefits Paid
 
(4.4
)
 
(4.6
)
Medicare Part D Subsidy Received
 
0.3

 
0.3

Plan Amendments
 
(11.0
)
 
—

Actuarial Loss (Gain)
 
(1.3
)
 
0.4

Accumulated Postretirement Benefit Obligation at End of Year
 
15.1

 
29.6

Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plan Assets
 
$
(15.1
)
 
$
(29.6
)
Unamortized Actuarial Gain Reported in AOCI at End of Year
 
$
27.6

 
$
16.8
Schedule of Assumptions Used
The weighted-average discount rate and rate of increase in future compensation levels used to develop OPEB Expense for the years ended December 31, 2016, 2015 and 2014 were:
 
 
2016
 
2015
 
2014
Weighted-average Discount Rate
 
3.70
%
 
3.40
%
 
4.00
%
Service Cost Discount Rate
 
4.21

 
—

 
—

Interest Cost Discount Rate
 
2.90

 
—

 
—

Rate of Increase in Future Compensation Levels
 
2.64

 
2.68

 
2.10

The weighted-average discount rate and rate of increase in future compensation levels used to develop the components of the Accumulated Postretirement Benefit Obligation at December 31, 2016 and 2015 were:
 
 
2016
 
2015
Discount Rate
 
3.60
%
 
3.70
%
Rate of Increase in Future Compensation Levels
 
2.60

 
2.64
Schedule of Comprehensive Other Postretirement Employee Benefit Expense
The components of Comprehensive OPEB Expense (Income) for the years ended December 31, 2016, 2015 and 2014 were:
DOLLARS IN MILLIONS
 
2016
 
2015
 
2014
Service Cost Earned During the Year
 
$
0.1

 
$
0.2

 
$
0.2

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.8

 
1.0

 
1.1

Amortization of Actuarial Gain
 
(1.4
)
 
(1.4
)
 
(1.8
)
OPEB Income Recognized in Consolidated Statements of Income
 
(0.5
)
 
(0.2
)
 
(0.5
)
Unrecognized OPEB Loss (Gain) Arising During the Year
 
(1.3
)
 
0.4

 
(2.0
)
Prior Service Credit Arising During the Year
 
(11.0
)
 
—

 
—

Amortization of Accumulated Unrecognized OPEB Gain
 
1.4

 
1.4

 
1.8

Comprehensive OPEB Expense (Income)
 
$
(11.4
)
 
$
1.6

 
$
(0.7
)
Schedule of Expected Benefit Payments
The following benefit payments (net of participant contributions), which consider expected future service, as appropriate, are expected to be paid:
DOLLARS IN MILLIONS
 
Years Ending December 31,
2017
 
2018
 
2019
 
2020
 
2021
 
2022-2026
Estimated Benefit Payments:
 
 
 
 
 
 
 
 
 
 
 
 
Excluding Medicare Part D Subsidy
 
$
1.8

 
$
1.8

 
$
1.7

 
$
1.6

 
$
1.5

 
$
5.9

Expected Medicare Part D Subsidy
 
—

 
—

 
—

 
—

 
—

 
—

Net Estimated Benefit Payments
 
$
1.8

 
$
1.8

 
$
1.7

 
$
1.6

 
$
1.5

 
$
5.9