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Retirement Benefit Plans (Tables) | 12 Months Ended
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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 | )

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