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Retirement Benefit Plans - Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in plan assets:      
Funded status of plan $ (200.0) $ (186.4)  
Amounts recognized in Balance Sheet [Abstract]      
Non-current liabilities (298.3) (301.6)  
NSK Warner [Member]      
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]      
Net amount [1] 9.2 9.7  
Other Postretirement Benefits Plan [Member]      
Change in benefit obligation [Roll Forward]      
Projected benefit obligation, January 1 107.0 119.9  
Service cost 0.1 0.1 $ 0.2
Interest cost 2.9 3.2 4.0
Plan amendments 0.0 (0.7)  
Actuarial (gain) loss (6.7) 2.2  
Acquisition 0.0 0.0  
Benefits paid (16.8) (17.7)  
Projected benefit obligation, December 31 86.5 107.0 119.9
Change in plan assets:      
Funded status of plan (86.5) (107.0)  
Amounts recognized in Balance Sheet [Abstract]      
Non-current assets 0.0 0.0  
Current liabilities (11.0) (13.2)  
Non-current liabilities (75.5) (93.8)  
Net amount (86.5) (107.0)  
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]      
Net actuarial loss 13.2 20.8  
Net prior service (credit) cost (11.8) (15.8)  
Net amount [1] 1.4 5.0  
Domestic Plan [Member] | Pension Plan [Member]      
Change in benefit obligation [Roll Forward]      
Projected benefit obligation, January 1 283.3 282.5  
Interest cost 8.5 8.9 9.6
Actuarial (gain) loss (18.2) 8.7  
Acquisition 0.0 4.0  
Benefits paid (20.7) (20.8)  
Projected benefit obligation, December 31 252.9 283.3 282.5
Change in plan assets:      
Fair value of plan assets, January 1 240.1 229.5  
Actual return on plan assets (10.7) 23.5  
Employer contribution 7.0 4.0  
Acquisition 0.0 3.8  
Benefits paid (20.6) (20.7)  
Fair value of plan assets, December 31 215.8 240.1 229.5
Funded status of plan (37.1) (43.2)  
Amounts recognized in Balance Sheet [Abstract]      
Non-current assets 0.0 0.0  
Current liabilities (0.5) (0.1)  
Non-current liabilities (36.6) (43.1)  
Net amount (37.1) (43.2)  
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]      
Net actuarial loss 113.1 111.0  
Net prior service (credit) cost (5.8) (6.6)  
Net amount [1] 107.3 104.4  
Defined Benefit Plan, Accumulated Benefit Obligation 252.9 283.3  
Foreign Plan [Member] | Pension Plan [Member]      
Change in benefit obligation [Roll Forward]      
Projected benefit obligation, January 1 628.8 528.2  
Service cost 17.9 18.0 16.2
Interest cost 12.0 11.0 12.5
Plan participants' contributions 0.3 0.3  
Plan amendments 1.7 0.0  
Settlement and curtailment (4.3) (3.7)  
Actuarial (gain) loss 4.9 (7.8)  
Currency translation (29.4) 63.4  
Acquisition 0.0 37.0  
Benefits paid (19.6) (17.6)  
Projected benefit obligation, December 31 612.3 628.8 528.2
Change in plan assets:      
Fair value of plan assets, January 1 483.4 393.8  
Actual return on plan assets (18.1) 30.7  
Employer contribution 18.8 14.3  
Plan participants' contribution 0.3 0.3  
Settlements (4.3) (3.6)  
Currency translation (22.0) 46.8  
Acquisition 0.0 18.1  
Other 0.0 0.6  
Benefits paid (19.6) (17.6)  
Fair value of plan assets, December 31 438.5 483.4 $ 393.8
Funded status of plan (173.8) (145.4)  
Amounts recognized in Balance Sheet [Abstract]      
Non-current assets 16.7 23.2  
Current liabilities (4.4) (3.9)  
Non-current liabilities (186.1) (164.7)  
Net amount (173.8) (145.4)  
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]      
Net actuarial loss 193.0 159.0  
Net prior service (credit) cost 2.2 0.8  
Net amount [1] 195.2 159.8  
Defined Benefit Plan, Accumulated Benefit Obligation $ 583.3 $ 602.0  
[1] 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.