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Other Postretirement Employee Benefit Plans (Tables) - Other postretirement benefits
 12 Months Ended
Dec. 31, 2019
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):
 
2019
 
2018
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
(141.6
)
 
$
(155.1
)
Service cost
(0.4
)
 
(0.4
)
Interest cost
(5.3
)
 
(5.0
)
Amendments, curtailments and other
(0.1
)
 
(5.3
)
Actuarial (loss) gain
(4.2
)
 
8.4

Retiree contributions
(1.7
)
 
(2.6
)
Benefits paid
14.4

 
18.4

Benefit obligation at end of year
(138.9
)
 
(141.6
)
Change in plan assets:
 
 
 
Fair value of plan assets
—

 
—

Funded status
$
(138.9
)
 
$
(141.6
)
Weighted Average Assumptions Used To Determine Benefit Obligations And Cost
Weighted average assumptions used to determine benefit obligations at date of measurement:
 
2019
 
2018
Discount rate
3.1
%
 
4.2
%
Medical trend rate – initial
5.7
%
 
6.0
%
Medical trend rate – grading period
18 years

 
19 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
$
0.1

 
$
(0.1
)
Effect on postretirement medical benefit obligation
2.1

 
(1.8
)
Components of Net Periodic Pension Cost
Components of net periodic benefit cost:
($ in millions)
2019
 
2018
Service cost
$
(0.4
)
 
$
(0.4
)
Interest cost
(5.3
)
 
(5.0
)
Amortization of prior service credit
2.1

 
2.5

Net periodic benefit cost
$
(3.6
)
 
$
(2.9
)
Disaggregation of Service Cost The net periodic benefit cost of the other postretirement employee benefit plans incurred during the years ended December 31, 2019, 2018 and 2017 are reflected in the following captions in the accompanying Consolidated Statements of Earnings ($ in millions):
 
Year Ended December 31
 
2019
 
2018
 
2017
Service cost:
 
 
 
 
 
Cost of sales
$
(0.1
)
 
$
(0.1
)
 
$
(0.1
)
Selling, general and administrative expenses
(0.3
)
 
(0.3
)
 
(0.6
)
Total service cost
(0.4
)
 
(0.4
)
 
(0.7
)
Other net periodic pension costs:
 
 
 
 
 
Nonoperating income (expense), net
(3.2
)
 
(2.5
)
 
(2.2
)
Total
$
(3.6
)
 
$
(2.9
)
 
$
(2.9
)
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):
2020
$
15.8

2021
13.9

2022
12.6

2023
11.6

2024
10.9

2025 - 2029
47.0