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Employee Benefits Schedule of Net Benefit Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit cost and key assumptions are listed below.
 
Domestic Pension Plan
 
Foreign Pension Plans
 
Domestic Postretirement Benefit Plan
Years ended December 31,
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Service cost
$
0.0

 
$
0.0

 
$
0.0

 
$
5.4

 
$
4.9

 
$
6.7

 
$
0.0

 
$
0.0

 
$
0.0

Interest cost
4.5

 
5.1

 
5.9

 
13.1

 
13.5

 
15.1

 
1.1

 
1.3

 
1.5

Expected return on plan assets
(6.6
)
 
(6.2
)
 
(6.6
)
 
(18.8
)
 
(17.7
)
 
(18.7
)
 
0.0

 
0.0

 
0.0

Settlement and curtailment (gains) losses
0.0

 
0.0

 
0.0

 
(1.0
)
 
6.8

 
0.4

 
0.0

 
0.0

 
0.0

Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.0

 
0.0

 
0.0

 
0.1

 
0.1

 
0.1

 
(0.2
)
 
(0.2
)
 
(0.2
)
Net actuarial losses
1.6

 
1.5

 
1.3

 
5.9

 
5.5

 
4.2

 
0.1

 
0.0

 
0.0

Net periodic cost
$
(0.5
)
 
$
0.4

 
$
0.6

 
$
4.7

 
$
13.1

 
$
7.8

 
$
1.0

 
$
1.1

 
$
1.3

 Assumptions
 
Domestic Pension Plan
 
Foreign Pension Plans
 
Domestic Postretirement Benefit Plan
Years ended December 31,
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net periodic cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
3.70
%
 
4.20
%
 
4.80
%
 
2.36
%
 
2.52
%
 
3.61
%
 
3.65
%
 
4.05
%
 
4.65
%
Rate of compensation increase
N/A

 
N/A

 
N/A

 
2.37
%
 
2.36
%
 
3.18
%
 
N/A

 
N/A

 
N/A

Expected return on plan assets
7.00
%
 
7.00
%
 
7.00
%
 
4.70
%
 
4.66
%
 
5.38
%
 
N/A

 
N/A

 
N/A

Interest crediting rates
5.10
%
 
5.10
%
 
5.10
%
 
1.31
%
 
1.29
%
 
1.35
%
 
N/A

 
N/A

 
N/A

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.35
%
 
3.70
%
 
4.20
%
 
2.61
%
 
2.36
%
 
2.52
%
 
4.30
%
 
3.65
%
 
4.05
%
Rate of compensation increase
N/A

 
N/A

 
N/A

 
2.58
%
 
2.37
%
 
2.36
%
 
N/A

 
N/A

 
N/A

Interest crediting rates
5.10
%
 
5.10
%
 
5.10
%
 
1.44
%
 
1.31
%
 
1.29
%
 
N/A

 
N/A

 
N/A

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Health care cost trend rate assumed for next year
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Initial rate (weighted-average)
 
 
 
 
 
 
 
 
 
 
 
 
6.25
%
 
6.50
%
 
6.75
%
Year ultimate rate is reached
 
 
 
 
 
 
 
 
 
 
 
 
2024

 
2024

 
2024

Ultimate rate
 
 
 
 
 
 
 
 
 
 
 
 
5.00
%
 
5.00
%
 
5.00
%