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Other Postretirement Employee Benefit Plans (Tables) - Other Postretirement Benefits
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
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):
 
2016
 
2015
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
193.4

 
$
221.4

Service cost
0.7

 
1.1

Interest cost
6.6

 
8.4

Amendments, curtailments and other
(6.5
)
 
(3.6
)
Actuarial gain
(5.0
)
 
(22.7
)
Acquisitions
—

 
5.0

Retiree contributions
3.2

 
3.6

Benefits paid
(17.8
)
 
(19.8
)
Benefit obligation at end of year
174.6

 
193.4

Change in plan assets:
 
 
 
Fair value of plan assets
—

 
—

Funded status
$
(174.6
)
 
$
(193.4
)
Weighted Average Assumptions Used To Determine Benefit Obligations And Cost  
Weighted average assumptions used to determine benefit obligations at date of measurement:
 
2016
 
2015
Discount rate
3.9
%
 
4.2
%
Medical trend rate – initial
6.5
%
 
6.8
%
Medical trend rate – grading period
21 years

 
22 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
$
0.3

 
$
(0.3
)
Effect on postretirement medical benefit obligation
5.3

 
(4.7
)
Components of Net Periodic Pension Cost
The following sets forth the components of the Company’s net periodic benefit cost of the other postretirement employee benefit plans ($ in millions): 
 
Three-Month Period Ended
 
March 31, 2017
 
April 1, 2016
Service cost
$
0.2

 
$
0.2

Interest cost
1.3

 
1.4

Amortization of actuarial loss
—

 
0.1

Amortization of prior service credit
(0.8
)
 
(0.8
)
Net periodic benefit cost
$
0.7

 
$
0.9
Components of net periodic benefit cost:
($ in millions)
2016
 
2015
Service cost
$
0.7

 
$
1.1

Interest cost
6.6

 
8.4

Amortization of net loss
—

 
1.0

Amortization of prior service credit
(3.1
)
 
(3.1
)
Net periodic benefit cost
$
4.2

 
$
7.4
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):
2017
$
16.7

2018
16.3

2019
15.8

2020
15.1

2021
14.4

2022 – 2026
61.4