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Other Post-Retirement Employee Benefit Plans (Tables) - Other Post-Retirement Benefits
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plans and Other Post-Retirement Benefit Plans [Line Items]  
Funded Status Of Pension Plans
The following sets forth the funded status of the domestic plans as of the most recent actuarial valuations using measurement dates of December 31 ($ in millions):
 
 
2014
 
2013
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
194.8

 
$
256.4

Service cost
1.1

 
1.5

Interest cost
10.3

 
9.1

Amendments, curtailments and other
(1.0
)
 
(32.5
)
Actuarial loss (gain)
33.2

 
(26.1
)
Retiree contributions
3.7

 
6.0

Benefits paid
(20.7
)
 
(19.6
)
Benefit obligation at end of year
221.4

 
194.8

Change in plan assets:
 
 
 
Fair value of plan assets
—

 
—

Funded status
$
(221.4
)
 
$
(194.8
)
Weighted Average Assumptions Used To Determine Benefit Obligations And Cost
Weighted average assumptions used to determine benefit obligations at date of measurement:
 
 
2014
 
2013
Discount rate
4.00
%
 
4.80
%
Medical trend rate – initial
7.10
%
 
7.30
%
Medical trend rate – grading period
14 years

 
15 years

Medical trend rate – ultimate
4.50
%
 
4.50
%
Effect Of One-Percentage-Point Change In Assumed Health Care Cost Trend Rates
Effect of a one-percentage-point change in assumed health care cost trend rates:
 
($ in millions)
1% Increase
 
1% Decrease
Effect on the total of service and interest cost components
$
0.6

 
$
(0.4
)
Effect on post-retirement medical benefit obligation
8.1

 
(7.2
)
Components of Net Periodic Pension Cost
Components of net periodic benefit cost:
($ in millions)
2014
 
2013
Service cost
$
1.1

 
$
1.5

Interest cost
10.3

 
9.1

Amortization of loss
1.4

 
1.4

Amortization of prior service credit
(4.1
)
 
(6.9
)
Net periodic benefit cost
$
8.7

 
$
5.1
Benefit Payments That Reflect Expected Future Service
The following sets forth benefit payments, which reflect expected future service, as appropriate, expected to be paid in the periods indicated ($ in millions):
 
2015
$
20.1

2016
19.9

2017
19.5

2018
19.2

2019
18.8

2020 – 2024
81.2