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Pension and Postretirement Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
Pension and postretirement benefit costs for these plans were comprised of:
 
Pension Benefits
 
Postretirement and Other Benefits
(dollars in millions)
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Service cost
$
—

 
$
0.3

 
$
1.0

 
$
0.3

 
$
0.3

 
$
0.3

Interest cost on projected benefit obligation
19.3

 
19.0

 
21.0

 
3.3

 
3.3

 
4.0

Expected return on plan assets
(27.3
)
 
(29.2
)
 
(28.1
)
 
—

 
—

 
—

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (benefit)
0.1

 
0.1

 
0.2

 
(14.7
)
 
(15.4
)
 
(15.4
)
Actuarial loss
19.1

 
24.9

 
17.3

 
4.9

 
5.4

 
5.4

Curtailment loss
—

 
0.3

 
—

 
—

 
—

 
—

Pension/postretirement cost (benefit)
$
11.2

 
$
15.4

 
$
11.4

 
$
(6.2
)
 
$
(6.4
)
 
$
(5.7
)
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Changes in the plans' benefit obligations and funded status are as follows:
 
 
 
 
 
Postretirement and Other Benefits
 
Pension Benefits
 
(dollars in millions)
2016
 
2015
 
2016
 
2015
Change in benefit obligation:
 
 
 
 
 
 
 
   Benefit obligation at January 1,
$
530.5

 
$
577.3

 
$
93.1

 
$
109.0

Service cost
—

 
0.3

 
0.3

 
0.3

Interest cost
19.3

 
19.0

 
3.3

 
3.3

Actuarial gain
(2.7
)
 
(18.8
)
 
(4.7
)
 
(10.9
)
Benefits paid
(41.5
)
 
(47.3
)
 
(13.1
)
 
(12.7
)
Retiree drug subsidy received
—

 
—

 
0.6

 
0.2

Other
—

 
—

 
3.1

 
3.9

Benefit obligation at December 31,
$
505.6

 
$
530.5

 
$
82.6

 
$
93.1

 
 
 
 
 
 
 
 
Change in plan assets:
 
 
 
 
 
 
 
   Fair value of plan assets at January 1,
$
378.1

 
$
424.3

 
$
10.3

 
$
11.0

Actual return (loss) on plan assets
30.3

 
(10.5
)
 
0.3

 
0.1

Employer contributions
5.4

 
11.6

 
10.6

 
11.7

Retiree drug subsidy received
—

 
—

 
0.6

 
0.2

Benefits paid
(41.5
)
 
(47.3
)
 
(13.1
)
 
(12.7
)
   Fair value of plan assets at December 31,
372.3

 
378.1

 
8.7

 
10.3

Unfunded status
$
(133.3
)
 
$
(152.4
)

$
(73.9
)

$
(82.8
)
Schedule of Health Care Cost Trend Rates [Table Text Block]
The assumed healthcare cost trend rate used to measure the postretirement health benefit obligation is shown below:
 
December 31,
 
2016
 
2015
Healthcare cost trend
6.5
%
 
6.5
%
Rate to which the cost trend is assumed to decline (ultimate trend rate)
4.5
%
 
4.5
%
Year the rates reach the ultimate trend rate
2021

 
2020
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
A one-percentage point change in assumed healthcare cost trend rates would have the following effect on the postretirement benefit costs and obligation:
(dollars in millions)
1% Increase
 
1% Decrease
Service and interest costs for 2016
$
0.2

 
$
(0.1
)
Postretirement benefit obligation at December 31, 2016
3.2

 
(2.9
)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
The projected benefit obligation is recognized in the Consolidated Balance Sheets as follows:
 
Pension Benefits
 
Postretirement and Other Benefits
 
December 31,
 
December 31,
(dollars in millions)
2016
 
2015
 
2016
 
2015
Accrued payroll and benefits (current liability)
$
2.1

 
$
2.1

 
$
9.4

 
$
10.1

Pension and postretirement benefit obligations (noncurrent liability)
131.2

 
150.3

 
64.5

 
72.7

Total
$
133.3

 
$
152.4

 
$
73.9

 
$
82.8
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
Amounts recognized in "Accumulated other comprehensive loss" in the Consolidated Balance Sheets which have not yet been recognized in net pension costs consisted of the following:
 
 
 
 
 
Postretirement and Other Benefits
 
Pension Benefits
 
 
December 31,
 
December 31,
(dollars in millions)
2016
 
2015
 
2016
 
2015
Prior service (cost) benefit, net of tax of ($0.1), ($0.1), $10.6, $15.8
$
(0.1
)
 
$
(0.2
)
 
$
19.1

 
$
28.6

Actuarial loss, net of tax of ($81.6), ($90.4), ($19.7), ($23.0)
(141.8
)
 
(157.8
)
 
(34.8
)
 
(40.9
)
Total
$
(141.9
)
 
$
(158.0
)
 
$
(15.7
)
 
$
(12.3
)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in "Accumulated other comprehensive loss" on the Consolidated Statements of Shareowners’ Deficit and the Consolidated Statements of Comprehensive Income are shown below:
 
Pension Benefits
 
Postretirement and Other Benefits
(dollars in millions)
2016
 
2015
 
2016
 
2015
Prior service cost recognized:
 
 
 
 
 
 
 
     Reclassification adjustments
$
0.1

 
$
0.4

 
$
(14.7
)
 
$
(15.4
)
Actuarial (loss) gain recognized:
 
 
 
 
 
 
 
     Reclassification adjustments
19.1

 
24.9

 
4.9

 
5.4

     Actuarial gain (loss) arising during the period
5.7

 
(20.9
)
 
4.5

 
10.9
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The following amounts currently included in "Accumulated other comprehensive loss" are expected to be recognized in 2017 as a component of net periodic pension and postretirement cost:
 
Pension Benefits
 
Postretirement and Other Benefits
(dollars in millions)
 
Prior service benefit
$
—

 
$
(4.5
)
Actuarial loss
16.5

 
4.3

Total
$
16.5

 
$
(0.2
)
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of the pension plan assets at December 31, 2016 and 2015 by asset category are as follows:
(dollars in millions)
December 31, 2016
 
Quoted Prices
in active
markets
Level 1
 
Significant
observable
inputs
Level 2
 
Significant
unobservable
inputs
Level 3
Mutual funds
 
 
 
 
 
 
 
U.S. equity index funds
$
142.7

 
$
142.7

 
$
—

 
$
—

International equity index funds
95.6

 
95.6

 
—

 
—

Fixed income bond funds
123.9

 
123.9

 
—

 
—

Fixed income short-term money market funds
10.1

 
10.1

 
—

 
—

Group insurance contract
8.7

 
—

 
—

 
—

Total
$
381.0

 
$
372.3

 
$
—

 
$
—


(dollars in millions)
 
December 31, 2015
 
Quoted Prices
in active
markets
Level 1
 
Significant
observable
inputs
Level 2
 
Significant
unobservable
inputs
Level 3
Mutual funds
 
 
 
 
 
 
 
 
U.S. equity index funds
 
$
147.8

 
$
147.8

 
$
—

 
$
—

International equity index funds
 
97.0

 
97.0

 
—

 
—

Fixed income bond funds
 
133.3

 
133.3

 
—

 
—

Group insurance contract
 
10.3

 
—

 
—

 
—

Total
 
$
388.4

 
$
378.1

 
$
—

 
$
—
Schedule of Expected Benefit Payments [Table Text Block]
The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next ten years:
(dollars in millions)
Pension
Benefits
 
Postretirement
and Other
Benefits
 
Medicare
Subsidy
Receipts
2017
$
42.1

 
$
9.9

 
$
(0.5
)
2018
41.8

 
9.2

 
(0.5
)
2019
40.2

 
7.8

 
(0.4
)
2020
39.8

 
7.0

 
(0.4
)
2021
38.1

 
6.7

 
(0.4
)
Years 2022 - 2026
169.5

 
28.1

 
(1.4
)
Net Periodic Cost [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Assumptions Used [Table Text Block]
The following are the weighted-average assumptions used in measuring the net periodic cost of the pension and postretirement benefits:
 
Pension Benefits
 
 
Postretirement and Other Benefits
 
 
2016
 
2015
 
2014
 
 
2016
 
2015
 
2014
 
Discount rate
3.80
%
 
3.40
%
*
4.20
%
 
 
3.70
%
 
3.40
%
 
4.10
%
 
Expected long-term rate of return
7.50
%
 
7.75
%
 
7.75
%
 
 
—

 
—

 
—

 
Future compensation growth rate
—

 
—

 
—

 
 
—

 
—

 
—

 

* Discount rate used for the remeasurement of the non-management pension plan in April 2015 was consistent with the discount rate previously established.
Projected Benefit Obligation [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Assumptions Used [Table Text Block]
The following are the weighted-average assumptions used in accounting for and measuring the projected benefit obligations:
 
Pension Benefits
 
Postretirement and Other Benefits
 
December 31,
 
December 31,
 
2016
 
2015
 
2016
 
2015
Discount rate
4.00
%
 
3.80
%
 
4.00
%
 
3.70
%
Expected long-term rate of return
7.50
%
 
7.75
%
 
—

 
—

Future compensation growth rate
—

 
—

 
—

 
—