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Retirement Benefit Plans - Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in plan assets: |  |  |  |
Funded status of plan |  | $ (186.4) | $ (170.7) |
Amounts recognized in Balance Sheet [Abstract] |  |  |  |
Non-current liabilities |  | (301.6) | (294.1) |
NSK Warner [Member] |  |  |  |
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract] |  |  |  |
Net amount | [1] | 9.7 | 10.8 |
U.S. other postretirement benefit plans [Member] |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |
Projected benefit obligation, January 1 |  | 119.9 | 145.3 |
Service cost |  | 0.1 | 0.2 | $ 0.2
Interest cost |  | 3.2 | 4.0 | 5.7
Plan amendments |  | (0.7) | 0.0 |
Actuarial loss (gain) |  | 2.2 | (14.4) |
Acquisition |  | 0.0 | 0.0 |
Benefits paid |  | (17.7) | (15.2) |
Projected benefit obligation, December 31 |  | 107.0 | 119.9 | 145.3
Change in plan assets: |  |  |  |
Funded status of plan |  | (107.0) | (119.9) |
Amounts recognized in Balance Sheet [Abstract] |  |  |  |
Non-current assets |  | 0.0 | 0.0 |
Current liabilities |  | (13.2) | (14.5) |
Non-current liabilities |  | (93.8) | (105.4) |
Net amount |  | (107.0) | (119.9) |
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract] |  |  |  |
Net actuarial loss |  | 20.8 | 19.9 |
Net prior service (credit) cost |  | (15.8) | (19.2) |
Net amount | [1] | 5.0 | 0.7 |
United States | Pension Plan [Member] |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |
Projected benefit obligation, January 1 |  | 282.5 | 300.7 |
Interest cost |  | 8.9 | 9.6 | 11.2
Settlement and curtailment |  |  |  | (48.0)
Actuarial loss (gain) |  | 8.7 | (5.7) |
Acquisition |  | 4.0 | 0.0 |
Benefits paid |  | (20.8) | (22.1) |
Projected benefit obligation, December 31 |  | 283.3 | 282.5 | 300.7
Change in plan assets: |  |  |  |
Fair value of plan assets, January 1 |  | 229.5 | 235.8 |
Actual return on plan assets |  | 23.5 | 12.7 |
Employer contribution |  | 4.0 | 2.7 |
Settlements |  |  |  | 48.0
Acquisition |  | (3.8) | 0.0 |
Benefits paid |  | 20.7 | 21.7 |
Fair value of plan assets, December 31 |  | 240.1 | 229.5 | 235.8
Funded status of plan |  | (43.2) | (53.0) |
Amounts recognized in Balance Sheet [Abstract] |  |  |  |
Non-current assets |  | 0.0 | 0.0 |
Current liabilities |  | (0.1) | (0.1) |
Non-current liabilities |  | (43.1) | (52.9) |
Net amount |  | (43.2) | (53.0) |
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract] |  |  |  |
Net actuarial loss |  | 111.0 | 116.9 |
Net prior service (credit) cost |  | (6.6) | (7.4) |
Net amount | [1] | 104.4 | 109.5 |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 283.3 | 282.5 |
Non-US [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant |  | 0.3 | 0.4 |
Change in benefit obligation [Roll Forward] |  |  |  |
Projected benefit obligation, January 1 |  | 528.2 | 508.5 |
Service cost |  | 18.0 | 16.2 | 14.9
Interest cost |  | 11.0 | 12.5 | 14.1
Plan amendments |  |  | 0.2 |
Settlement and curtailment |  | (3.7) | (1.3) |
Actuarial loss (gain) |  | (7.8) | 70.2 |
Currency translation |  | 63.4 | (45.3) |
Acquisition |  | 37.0 |  |
Divestiture |  |  | (12.8) |
Benefits paid |  | (17.6) | (20.4) |
Projected benefit obligation, December 31 |  | 628.8 | 528.2 | 508.5
Change in plan assets: |  |  |  |
Fair value of plan assets, January 1 |  | 393.8 | 395.1 |
Actual return on plan assets |  | 30.7 | 54.0 |
Employer contribution |  | 14.3 | 17.0 |
Plan participants' contribution |  | 0.3 | 0.4 |
Settlements |  | 3.6 | 1.3 |
Currency translation |  | 46.8 | (40.8) |
Divestiture |  | 18.1 | 10.2 |
Other |  | 0.6 |  |
Benefits paid |  | 17.6 | 20.4 |
Fair value of plan assets, December 31 |  | 483.4 | 393.8 | $ 395.1
Funded status of plan |  | (145.4) | (134.4) |
Amounts recognized in Balance Sheet [Abstract] |  |  |  |
Non-current assets |  | 23.2 | 4.9 |
Current liabilities |  | (3.9) | (3.5) |
Non-current liabilities |  | (164.7) | (135.8) |
Net amount |  | (145.4) | (134.4) |
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract] |  |  |  |
Net actuarial loss |  | 159.0 | 163.7 |
Net prior service (credit) cost |  | 0.8 | 0.8 |
Net amount | [1] | 159.8 | 164.5 |
Defined Benefit Plan, Accumulated Benefit Obligation |  | $ 602.0 | $ 505.5 |
[1] | 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.

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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