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Other Postretirement Employee Benefit Plans (Tables) - Other Postretirement Benefits
 12 Months Ended
Dec. 31, 2015
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):
 
2015
 
2014
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
221.4

 
$
194.8

Service cost
1.1

 
1.1

Interest cost
8.4

 
10.3

Amendments, curtailments and other
(3.6
)
 
(1.0
)
Actuarial (gain) loss
(22.7
)
 
33.2

Acquisitions
5.0

 
—

Retiree contributions
3.6

 
3.7

Benefits paid
(19.8
)
 
(20.7
)
Benefit obligation at end of year
193.4

 
221.4

Change in plan assets:
 
 
 
Fair value of plan assets
—

 
—

Funded status
$
(193.4
)
 
$
(221.4
)
Weighted Average Assumptions Used To Determine Benefit Obligations And Cost
Weighted average assumptions used to determine benefit obligations at date of measurement:
 
2015
 
2014
Discount rate
4.2
%
 
4.0
%
Medical trend rate – initial
6.8
%
 
7.1
%
Medical trend rate – grading period
22 years

 
14 years

Medical trend rate – ultimate
4.5
%
 
4.5
%
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
$
0.5

 
$
(0.4
)
Effect on postretirement medical benefit obligation
6.6

 
(5.8
)
Components of Net Periodic Pension Cost
Components of net periodic benefit cost:
($ in millions)
2015
 
2014
Service cost
$
1.1

 
$
1.1

Interest cost
8.4

 
10.3

Amortization of net loss
1.0

 
1.4

Amortization of prior service credit
(3.1
)
 
(4.1
)
Net periodic benefit cost
$
7.4

 
$
8.7
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):
2016
$
17.9

2017
17.8

2018
17.6

2019
17.2

2020
16.5

2021 – 2025
71.2