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Pension and Postretirement Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Service cost
$
0.3

 
$
1.0

 
$
2.1

 
$
0.3

 
$
0.3

 
$
0.4

Interest cost on projected benefit obligation
19.0

 
21.0

 
18.8

 
3.3

 
4.0

 
4.0

Expected return on plan assets
(29.2
)
 
(28.1
)
 
(25.7
)
 
—

 
—

 
—

Amortization of:


 

 

 

 

 

Prior service cost (benefit)
0.1

 
0.2

 
0.2

 
(15.4
)
 
(15.4
)
 
(14.1
)
Actuarial loss
24.9

 
17.3

 
22.0

 
5.4

 
5.4

 
5.6

Curtailment loss (gain)
0.3

 
—

 
(0.6
)
 
—

 
—

 
—

Pension/postretirement cost (benefit)
$
15.4

 
$
11.4

 
$
16.8

 
$
(6.4
)
 
$
(5.7
)
 
$
(4.1
)
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)
2015
 
2014
 
2015
 
2014
Change in benefit obligation:
 
 
 
 
 
 
 
   Benefit obligation at January 1,
$
577.3

 
$
523.0

 
$
109.0

 
$
101.5

Service cost
0.3

 
1.0

 
0.3

 
0.3

Interest cost
19.0

 
21.0

 
3.3

 
4.0

Actuarial (gain) loss
(18.8
)
 
73.5

 
(10.9
)
 
13.3

Benefits paid
(47.3
)
 
(41.2
)
 
(12.7
)
 
(15.2
)
Retiree drug subsidy received
—

 
—

 
0.2

 
0.5

Other
—

 
—

 
3.9

 
4.6

Benefit obligation at December 31,
$
530.5

 
$
577.3

 
$
93.1

 
$
109.0

 
 
 
 
 
 
 
 
Change in plan assets:
 
 
 
 
 
 
 
   Fair value of plan assets at January 1,
$
424.3

 
$
399.3

 
$
11.0

 
$
11.3

Actual return on plan assets
(10.5
)
 
44.2

 
0.1

 
0.4

Employer contributions
11.6

 
22.0

 
11.7

 
14.0

Retiree drug subsidy received
—

 
—

 
0.2

 
0.5

Benefits paid
(47.3
)
 
(41.2
)
 
(12.7
)
 
(15.2
)
   Fair value of plan assets at December 31,
378.1

 
424.3

 
10.3

 
11.0

Unfunded status
$
(152.4
)
 
$
(153.0
)

$
(82.8
)

$
(98.0
)
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,
 
2015
 
2014
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
2020

 
2018
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 2015
$
0.2

 
$
(0.1
)
Postretirement benefit obligation at December 31, 2015
4.2

 
(3.8
)
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)
2015
 
2014
 
2015
 
2014
Accrued payroll and benefits (current liability)
$
2.1

 
$
2.2

 
$
10.1

 
$
12.0

Pension and postretirement benefit obligations (noncurrent liability)
150.3

 
150.8

 
72.7

 
86.0

Total
$
152.4

 
$
153.0

 
$
82.8

 
$
98.0
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)
2015
 
2014
 
2015
 
2014
Prior service (cost) benefit, net of tax of ($0.1), ($0.2), $15.8, $21.3
$
(0.2
)
 
$
(0.5
)
 
$
28.6

 
$
38.5

Actuarial loss, net of tax of ($90.4), ($91.5), ($23.0), ($29.3)
(157.8
)
 
(160.7
)
 
(40.9
)
 
(50.9
)
Total
$
(158.0
)
 
$
(161.2
)
 
$
(12.3
)
 
$
(12.4
)
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)
2015
 
2014
 
2015
 
2014
Prior service cost recognized:
 
 
 
 
 
 
 
     Reclassification adjustments
$
0.4

 
$
0.2

 
$
(15.4
)
 
$
(15.4
)
Actuarial (loss) gain recognized:
 
 
 
 
 
 
 
     Reclassification adjustments
24.9

 
17.3

 
5.4

 
5.4

     Actuarial (loss) gain arising during the period
(20.9
)
 
(57.5
)
 
10.9

 
(12.9
)
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 2016 as a component of net periodic pension and postretirement cost:
 
Pension Benefits
 
Postretirement and Other Benefits
(dollars in millions)
 
Prior service cost (benefit)
$
0.1

 
$
(14.8
)
Actuarial loss
18.2

 
4.9

Total
$
18.3

 
$
(9.9
)
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of the pension and postretirement plan assets at December 31, 2015 and 2014 by asset category are as follows:
(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

 
—

 
—

 
10.3

Total
$
388.4

 
$
378.1

 
$
—

 
$
10.3


(dollars in millions)
 
December 31, 2014
 
Quoted Prices
in active
markets
Level 1
 
Significant
observable
inputs
Level 2
 
Significant
unobservable
inputs
Level 3
Mutual funds
 
 
 
 
 
 
 
 
U.S. equity index funds
 
$
212.3

 
$
212.3

 
$
—

 
$
—

International equity index funds
 
61.1

 
61.1

 
—

 
—

Fixed income bond funds
 
150.9

 
150.9

 
—

 
—

Group insurance contract
 
11.0

 
—

 
—

 
11.0

Total
 
$
435.3

 
$
424.3

 
$
—

 
$
11.0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The Level 3 investments had the following changes in 2015 and 2014:
 
Pension
 
Postretirement and Other Benefits
(dollars in millions)
2015
 
2014
 
2015
 
2014
Balance, beginning of year
$
—

 
$
30.8

 
$
11.0

 
$
11.3

Realized gains, net
—

 
3.2

 
0.3

 
0.4

Purchases, sales, issuances and settlements, net
—

 
(34.0
)
 
(1.0
)
 
(0.7
)
Balance, end of year
$
—

 
$
—

 
$
10.3

 
$
11.0
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
2016
$
42.3

 
$
10.6

 
$
(0.5
)
2017
41.5

 
9.8

 
(0.5
)
2018
41.2

 
9.2

 
(0.5
)
2019
39.4

 
7.9

 
(0.5
)
2020
38.8

 
7.1

 
(0.4
)
Years 2021 - 2025
174.9

 
30.8

 
(1.7
)
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
 
 
2015
 
2014
 
2013
 
 
2015
 
2014
 
2013
 
Discount rate
3.40
%
*
4.20
%
 
3.30
%
**
 
3.40
%
 
4.10
%
 
3.40
%
***
Expected long-term rate of return
7.75
%
 
7.75
%
 
7.75
%
 
 
—

 
—

 
—

 
Future compensation growth rate
—

 
—

 
3.00
%
 
 
—

 
—

 
—

 

* Discount rate used for the remeasurement of the non-management pension plan in April 2015 was consistent with the discount rate previously established.
** Discount rate used for the remeasurement of the management pension plan in May 2013 was consistent with the discount rate previously established.
*** For the period January 1, 2013 through July 31, 2013, the date of the remeasurement, we used a 3.10% discount rate. From that date through December 31, 2013, we used a 3.90% discount rate.
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,
 
2015
 
2014
 
2015
 
2014
Discount rate
3.80
%
 
3.40
%
 
3.70
%
 
3.40
%
Expected long-term rate of return
7.75
%
 
7.75
%
 
—

 
—

Future compensation growth rate
—

 
—

 
—

 
—