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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Expense for defined contribution and defined benefit pension plans and other post employment defined benefit plans [Text Block]
 
Year Ended December 31,
(millions of dollars)
2018
 
2017
 
2016
Defined contribution expense
$
34.9

 
$
33.5

 
$
28.3

Defined benefit pension expense
8.5

 
12.5

 
10.1

Other postretirement employee benefit expense
0.1

 
0.5

 
1.4

Total
$
43.5

 
$
46.5

 
$
39.8
Reconciliation of the plans' benefit obligations, plan assets, funded status and recognition [Text Block]
 
Pension benefits
 
Other postretirement
 
Year Ended December 31,
 
employee benefits
 
2018
 
2017
 
Year Ended December 31,
(millions of dollars)
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
Change in projected benefit obligation:
 

 
 

 
 

 
 

 
 

 
 

Projected benefit obligation, January 1
$
283.3

 
$
628.8

 
$
282.5

 
$
528.2

 
$
107.0

 
$
119.9

Service cost
—

 
17.9

 
—

 
18.0

 
0.1

 
0.1

Interest cost
8.5

 
12.0

 
8.9

 
11.0

 
2.9

 
3.2

Plan participants’ contributions
—

 
0.3

 
—

 
0.3

 
—

 
—

Plan amendments
—

 
1.7

 
—

 
—

 
—

 
(0.7
)
Settlement and curtailment
—

 
(4.3
)
 
—

 
(3.7
)
 
—

 
—

Actuarial (gain) loss
(18.2
)
 
4.9

 
8.7

 
(7.8
)
 
(6.7
)
 
2.2

Currency translation
—

 
(29.4
)
 
—

 
63.4

 
—

 
—

Acquisition
—

 
—

 
4.0

 
37.0

 
—

 
—

Benefits paid
(20.7
)
 
(19.6
)
 
(20.8
)
 
(17.6
)
 
(16.8
)
 
(17.7
)
Projected benefit obligation, December 31
$
252.9

 
$
612.3

 
$
283.3

 
$
628.8

 
$
86.5

 
$
107.0

Change in plan assets:
 

 
 

 
 

 
 

 
 

 
 

Fair value of plan assets, January 1
$
240.1

 
$
483.4

 
$
229.5

 
$
393.8

 
 

 
 

Actual return on plan assets
(10.7
)
 
(18.1
)
 
23.5

 
30.7

 
 

 
 

Employer contribution
7.0

 
18.8

 
4.0

 
14.3

 
 

 
 

Plan participants’ contribution
—

 
0.3

 
—

 
0.3

 
 

 
 

Settlements
—

 
(4.3
)
 
—

 
(3.6
)
 


 


Currency translation
—

 
(22.0
)
 
—

 
46.8

 
 

 
 

Acquisition
—

 
—

 
3.8

 
18.1

 


 


Other
—

 
—

 
—

 
0.6

 
 
 
 
Benefits paid
(20.6
)
 
(19.6
)
 
(20.7
)
 
(17.6
)
 
 

 
 

Fair value of plan assets, December 31
$
215.8

 
$
438.5

 
$
240.1

 
$
483.4

 
 
 
 
Funded status
$
(37.1
)
 
$
(173.8
)
 
$
(43.2
)
 
$
(145.4
)
 
$
(86.5
)
 
$
(107.0
)
Amounts in the Consolidated Balance Sheets consist of:
 

 
 

 
 

 
 

 
 

 
 

Non-current assets
$
—

 
$
16.7

 
$
—

 
$
23.2

 
$
—

 
$
—

Current liabilities
(0.5
)
 
(4.4
)
 
(0.1
)
 
(3.9
)
 
(11.0
)
 
(13.2
)
Non-current liabilities
(36.6
)
 
(186.1
)
 
(43.1
)
 
(164.7
)
 
(75.5
)
 
(93.8
)
Net amount
$
(37.1
)
 
$
(173.8
)
 
$
(43.2
)
 
$
(145.4
)
 
$
(86.5
)
 
$
(107.0
)
Amounts in accumulated other comprehensive loss consist of:
 

 
 

 
 

 
 

 
 

 
 

Net actuarial loss
$
113.1

 
$
193.0

 
$
111.0

 
$
159.0

 
$
13.2

 
$
20.8

Net prior service (credit) cost
(5.8
)
 
2.2

 
(6.6
)
 
0.8

 
(11.8
)
 
(15.8
)
Net amount*
$
107.3

 
$
195.2

 
$
104.4

 
$
159.8

 
$
1.4

 
$
5.0

 
 
 
 
 
 
 
 
 
 
 
 
Total accumulated benefit obligation for all plans
$
252.9

 
$
583.3

 
$
283.3

 
$
602.0

 
 

 
 


________________
*
AOCI shown above does not include our equity investee, NSK-Warner. NSK-Warner had an AOCI loss of $9.2 million and $9.7 million at December 31, 2018 and 2017, respectively.
Funded status of pension plans with accumulated benefit obligations in excess of plan assets [Text Block]
 
December 31,
(millions of dollars)
2018
 
2017
Accumulated benefit obligation
$
(649.9
)
 
$
(681.2
)
Plan assets
449.9

 
494.8

Deficiency
$
(200.0
)
 
$
(186.4
)
Pension deficiency by country:
 

 
 

United States
$
(37.1
)
 
$
(43.2
)
Germany
(95.4
)
 
(75.7
)
Other
(67.5
)
 
(67.5
)
Total pension deficiency
$
(200.0
)
 
$
(186.4
)
Weighted average asset allocations of funded pensions plans and target allocations [Text Block]
 
December 31,
 
Target Allocation
 
2018
 
2017
 
U.S. Plans:
 

 
 

 
 
Real estate and other
11
%
 
11
%
 
0% - 15%
Fixed income securities
56
%
 
53
%
 
45% - 65%
Equity securities
33
%
 
36
%
 
25% - 45%
 
100
%
 
100
%
 
 
Non-U.S. Plans:
 

 
 

 
 
Real estate and other
8
%
 
8
%
 
0% - 10%
Fixed income securities
55
%
 
44
%
 
43% - 65%
Equity securities
37
%
 
48
%
 
30% - 56%
 
100
%
 
100
%
 
 
Components of net periodic benefit cost [Text Block]
 
Pension benefits
 
Other postretirement employee benefits
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
 
Year Ended December 31,
(millions of dollars)
US
 
Non-US
 
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
 
2016
Service cost
$
—

 
$
17.9

 
$
—

 
$
18.0

 
$
—

 
$
16.2

 
$
0.1

 
$
0.1

 
$
0.2

Interest cost
8.5

 
12.0

 
8.9

 
11.0

 
9.6

 
12.5

 
2.9

 
3.2

 
4.0

Expected return on plan assets
(13.6
)
 
(27.0
)
 
(13.2
)
 
(23.8
)
 
(15.0
)
 
(24.3
)
 
—

 
—

 
—

Settlements, curtailments and other
—

 
0.3

 
—

 
0.3

 
—

 
—

 
—

 
—

 
—

Amortization of unrecognized prior service (credit) cost
(0.8
)
 
0.1

 
(0.8
)
 
—

 
(0.8
)
 
0.6

 
(4.1
)
 
(4.1
)
 
(4.9
)
Amortization of unrecognized loss
4.2

 
6.9

 
4.2

 
7.9

 
5.1

 
6.2

 
1.2

 
1.3

 
2.1

Net periodic (income) cost
$
(1.7
)
 
$
10.2

 
$
(0.9
)
 
$
13.4

 
$
(1.1
)
 
$
11.2

 
$
0.1

 
$
0.5

 
$
1.4
Defined benefit plan weighted average assumptions used in calculating benefit obligations [Text Block]
 
December 31,
(percent)
2018
 
2017
U.S. pension plans:
 
 
 
Discount rate
4.24
 
3.55
Rate of compensation increase
N/A
 
N/A
U.S. other postretirement employee benefit plans:
 
 
 
Discount rate
4.05
 
3.32
Rate of compensation increase
N/A
 
N/A
Non-U.S. pension plans:
 
 
 
Discount rate
2.28
 
2.25
Rate of compensation increase
2.99
 
2.98


The Company's weighted-average assumptions used to determine the net periodic benefit cost/(income) for its defined benefit pension and other postretirement employee benefit plans for the years ended December 31, 2018 and 2017 were as follows:
 
Year Ended December 31,
(percent)
2018
 
2017
U.S. pension plans:
 
 
 
Discount rate - service cost
3.55
 
3.94
Effective interest rate on benefit obligation
3.13
 
3.26
Expected long-term rate of return on assets
6.00
 
6.01
Average rate of increase in compensation
N/A
 
N/A
U.S. other postretirement plans:
 
 
 
Discount rate - service cost
2.65
 
2.68
Effective interest rate on benefit obligation
2.86
 
2.85
Expected long-term rate of return on assets
N/A
 
N/A
Average rate of increase in compensation
N/A
 
N/A
Non-U.S. pension plans:
 
 
 
Discount rate - service cost
2.71
 
2.55
Effective interest rate on benefit obligation
1.98
 
1.96
Expected long-term rate of return on assets
5.73
 
5.68
Average rate of increase in compensation
2.98
 
3.00
Defined benefit plan estimated future benefit payments [Text Block]
 
 
Pension benefits
 
Other postretirement employee benefits
(millions of dollars)
 
 
 
 
 
Year
 
U.S.
 
Non-U.S.
 
2019
 
$
22.5

 
$
19.6

 
$
11.0

2020
 
19.8

 
21.7

 
10.3

2021
 
18.9

 
21.9

 
9.5

2022
 
18.3

 
22.6

 
9.1

2023
 
17.8

 
23.8

 
8.0

2024-2028
 
84.2

 
134.0

 
28.9
Defined benefit plan effect of one percentage point change in assumed health care cost trend rates [Text Block]
 
One Percentage Point
(millions of dollars)
Increase
 
Decrease
Effect on other postretirement employee benefit obligation
$
5.5

 
$
(4.9
)
Effect on total service and interest cost components
$
0.2

 
$
(0.2
)