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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Defined contribution expense
$
33.5

 
$
28.3

 
$
28.0

Defined benefit pension expense
12.5

 
10.1

 
35.5

Other postretirement employee benefit expense
0.5

 
1.4

 
3.3

Total
$
46.5

 
$
39.8

 
$
66.8
Reconciliation of the plans' benefit obligations, plan assets, funded status and recognition [Text Block]
 
Pension benefits
 
Other postretirement
 
Year Ended December 31,
 
employee benefits
 
2017
 
2016
 
Year Ended December 31,
(millions of dollars)
US
 
Non-US
 
US
 
Non-US
 
2017
 
2016
Change in projected benefit obligation:
 

 
 

 
 

 
 

 
 

 
 

Projected benefit obligation, January 1
$
282.5

 
$
528.2

 
$
300.7

 
$
508.5

 
$
119.9

 
$
145.3

Service cost
—

 
18.0

 
—

 
16.2

 
0.1

 
0.2

Interest cost
8.9

 
11.0

 
9.6

 
12.5

 
3.2

 
4.0

Plan participants’ contributions
—

 
0.3

 
—

 
0.4

 
—

 
—

Plan amendments
—

 
—

 
—

 
0.2

 
(0.7
)
 
—

Settlement and curtailment
—

 
(3.7
)
 
—

 
(1.3
)
 
—

 
—

Actuarial loss (gain)
8.7

 
(7.8
)
 
(5.7
)
 
70.2

 
2.2

 
(14.4
)
Currency translation
—

 
63.4

 
—

 
(45.3
)
 
—

 
—

Acquisition (divestiture)
4.0

 
37.0

 
—

 
(12.8
)
 
—

 
—

Benefits paid
(20.8
)
 
(17.6
)
 
(22.1
)
 
(20.4
)
 
(17.7
)
 
(15.2
)
Projected benefit obligation, December 31
$
283.3

 
$
628.8

 
$
282.5

 
$
528.2

 
$
107.0

 
$
119.9

Change in plan assets:
 

 
 

 
 

 
 

 
 

 
 

Fair value of plan assets, January 1
$
229.5

 
$
393.8

 
$
235.8

 
$
395.1

 
 

 
 

Actual return on plan assets
23.5

 
30.7

 
12.7

 
54.0

 
 

 
 

Employer contribution
4.0

 
14.3

 
2.7

 
17.0

 
 

 
 

Plan participants’ contribution
—

 
0.3

 
—

 
0.4

 
 

 
 

Settlements
—

 
(3.6
)
 
—

 
(1.3
)
 


 


Currency translation
—

 
46.8

 
—

 
(40.8
)
 
 

 
 

Acquisition (divestiture)
3.8

 
18.1

 
—

 
(10.2
)
 


 


Other
—

 
0.6

 
—

 
—

 
 
 
 
Benefits paid
(20.7
)
 
(17.6
)
 
(21.7
)
 
(20.4
)
 
 

 
 

Fair value of plan assets, December 31
$
240.1

 
$
483.4

 
$
229.5

 
$
393.8

 
 
 
 
Funded status
$
(43.2
)
 
$
(145.4
)
 
$
(53.0
)
 
$
(134.4
)
 
$
(107.0
)
 
$
(119.9
)
Amounts in the Consolidated Balance Sheets consist of:
 

 
 

 
 

 
 

 
 

 
 

Non-current assets
$
—

 
$
23.2

 
$
—

 
$
4.9

 
$
—

 
$
—

Current liabilities
(0.1
)
 
(3.9
)
 
(0.1
)
 
(3.5
)
 
(13.2
)
 
(14.5
)
Non-current liabilities
(43.1
)
 
(164.7
)
 
(52.9
)
 
(135.8
)
 
(93.8
)
 
(105.4
)
Net amount
$
(43.2
)
 
$
(145.4
)
 
$
(53.0
)
 
$
(134.4
)
 
$
(107.0
)
 
$
(119.9
)
Amounts in accumulated other comprehensive loss consist of:
 

 
 

 
 

 
 

 
 

 
 

Net actuarial loss
$
111.0

 
$
159.0

 
$
116.9

 
$
163.7

 
$
20.8

 
$
19.9

Net prior service (credit) cost
(6.6
)
 
0.8

 
(7.4
)
 
0.8

 
(15.8
)
 
(19.2
)
Net amount*
$
104.4

 
$
159.8

 
$
109.5

 
$
164.5

 
$
5.0

 
$
0.7

 
 
 
 
 
 
 
 
 
 
 
 
Total accumulated benefit obligation for all plans
$
283.3

 
$
602.0

 
$
282.5

 
$
505.5

 
 

 
 


________________
*
AOCI shown above does not include our equity investee, NSK-Warner. NSK-Warner had an AOCI loss of $9.7 million and $10.8 million at December 31, 2017 and 2016, respectively.
Funded status of pension plans with accumulated benefit obligations in excess of plan assets [Text Block]
 
December 31,
(millions of dollars)
2017
 
2016
Accumulated benefit obligation
$
(681.2
)
 
$
(594.0
)
Plan assets
494.8

 
423.3

Deficiency
$
(186.4
)
 
$
(170.7
)
Pension deficiency by country:
 

 
 

United States
$
(43.2
)
 
$
(53.0
)
Germany
(75.7
)
 
(77.5
)
Other
(67.5
)
 
(40.2
)
Total pension deficiency
$
(186.4
)
 
$
(170.7
)
Weighted average asset allocations of funded pensions plans and target allocations [Text Block]
 
December 31,
 
Target Allocation
 
2017
 
2016
 
U.S. Plans:
 

 
 

 
 
Real estate and other
11
%
 
9
%
 
0% - 15%
Fixed income securities
53
%
 
50
%
 
45% - 65%
Equity securities
36
%
 
41
%
 
25% - 45%
 
100
%
 
100
%
 
 
Non-U.S. Plans:
 

 
 

 
 
Real estate and other
8
%
 
5
%
 
0% - 10%
Fixed income securities
44
%
 
47
%
 
43% - 53%
Equity securities
48
%
 
48
%
 
46% - 56%
 
100
%
 
100
%
 
 
Components of net periodic benefit cost [Text Block]
 
Pension benefits
 
Other postretirement employee benefits
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
Year Ended December 31,
(millions of dollars)
US
 
Non-US
 
US
 
Non-US
 
US
 
Non-US
 
2017
 
2016
 
2015
Service cost
$
—

 
$
18.0

 
$
—

 
$
16.2

 
$
—

 
$
14.9

 
$
0.1

 
$
0.2

 
$
0.2

Interest cost
8.9

 
11.0

 
9.6

 
12.5

 
11.2

 
14.1

 
3.2

 
4.0

 
5.7

Expected return on plan assets
(13.2
)
 
(23.8
)
 
(15.0
)
 
(24.3
)
 
(17.0
)
 
(24.8
)
 
—

 
—

 
—

Settlements, curtailments and other
—

 
0.3

 
—

 
—

 
25.7

 
(0.8
)
 
—

 
—

 
—

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

 
(0.8
)
 
0.6

 
(0.8
)
 
0.1

 
(4.1
)
 
(4.9
)
 
(5.7
)
Amortization of unrecognized loss
4.2

 
7.9

 
5.1

 
6.2

 
6.3

 
6.6

 
1.3

 
2.1

 
3.1

Net periodic (income) cost
$
(0.9
)
 
$
13.4

 
$
(1.1
)
 
$
11.2

 
$
25.4

 
$
10.1

 
$
0.5

 
$
1.4

 
$
3.3
Defined benefit plan weighted average assumptions used in calculating benefit obligations [Text Block]
 
December 31,
(percent)
2017
 
2016
U.S. pension plans:
 
 
 
Discount rate
3.55
 
3.94
Rate of compensation increase
N/A
 
N/A
U.S. other postretirement employee benefit plans:

 

Discount rate
3.32
 
3.61
Rate of compensation increase
N/A
 
N/A
Non-U.S. pension plans:

 

Discount rate
2.25
 
2.25
Rate of compensation increase
2.98
 
3.00


The Company’s weighted-average assumptions used to determine the net periodic benefit cost for its defined benefit pension and other postretirement employee benefit plans for the years ended December 31, 2017, 2016 and 2015 were as follows:
 
Year Ended December 31,
(percent)
2017
 
2016
 
2015
U.S. pension plans:
 
 
 
 
 
Discount rate
3.94
 
4.15
 
3.89
Rate of compensation increase
N/A
 
N/A
 
N/A
Expected return on plan assets
6.01
 
6.70
 
6.71
U.S. other postretirement plans:
 
 
 
 
 
Discount rate
3.61
 
3.84
 
3.50
Rate of compensation increase
N/A
 
N/A
 
N/A
Expected return on plan assets
N/A
 
N/A
 
N/A
Non-U.S. pension plans:
 
 
 
 
 
Discount rate
2.25
 
2.99
 
2.84
Rate of compensation increase
3.00
 
3.01
 
2.84
Expected return on plan assets
5.68
 
6.41
 
6.53
Defined benefit plan estimated future benefit payments [Text Block]
 
 
Pension benefits
 
Other postretirement employee benefits
(millions of dollars)
 
 
 
 
 
Year
 
U.S.
 
Non-U.S.
 
2018
 
$
22.2

 
$
20.0

 
$
13.3

2019
 
19.5

 
20.5

 
12.2

2020
 
19.4

 
21.4

 
11.7

2021
 
19.3

 
22.4

 
10.6

2022
 
18.5

 
23.6

 
9.6

2023-2027
 
87.2

 
130.8

 
34.2
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
$
7.1

 
$
(6.3
)
Effect on total service and interest cost components
$
0.2

 
$
(0.2
)