Retirement Benefit Plans - Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets:
Funded status of plan		$ (170.7)	$ (166.6)
Amounts recognized in Balance Sheet [Abstract]
Non-current liabilities		(294.1)	(312.9)
NSK Warner [Member]
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net amount	[1]	10.8	7.1
U.S. Plans:
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		300.7	306.2
Interest cost		9.6	11.2	$ 12.1
Settlement and curtailment			(48.1)
Actuarial (gain) loss		(5.7)	(12.1)
Acquisition			68.1
Divestiture		0.0
Benefits paid and other		(22.1)	(24.6)
Projected benefit obligation, December 31		282.5	300.7	306.2
Change in plan assets:
Fair value of plan assets, January 1		235.8	265.6
Actual return on plan assets		12.7	(0.6)
Employer contribution		2.7
Defined Benefit Plan, Settlements, Plan Assets			(48.1)
Divestiture		0.0
Acquisition			43.5
Benefits paid		(21.7)	(24.6)
Fair value of plan assets, December 31		229.5	235.8	265.6
Funded status of plan		(53.0)	(64.9)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		0.0	0.0
Current liabilities		(0.1)	(0.3)
Non-current liabilities		(52.9)	(64.6)
Net amount		(53.0)	(64.9)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		116.9	125.4
Net prior service (credit) cost		(7.4)	(8.2)
Net amount	[1]	109.5	117.2
Defined Benefit Plan, Accumulated Benefit Obligation		282.5	300.7
Non-U.S. Plans:
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		508.5	527.8
Service cost		16.2	14.9	12.8
Interest cost		12.5	14.1	18.1
Plan participants’ contributions		0.4	0.3
Plan amendments		0.2
Settlement and curtailment		(1.3)	(4.7)
Actuarial (gain) loss		70.2	(9.0)
Currency translation		(45.3)	(42.9)
Acquisition			23.9
Divestiture		(12.8)
Benefits paid and other		(20.4)	(15.9)
Projected benefit obligation, December 31		528.2	508.5	527.8
Change in plan assets:
Fair value of plan assets, January 1		395.1	395.6
Actual return on plan assets		54.0	10.3
Employer contribution		17.0	19.3
Plan participants’ contributions		0.4	0.3
Defined Benefit Plan, Settlements, Plan Assets		(1.3)	(2.5)
Currency translation		(40.8)	(30.8)
Divestiture		(10.2)
Acquisition			18.8
Benefits paid		(20.4)	(15.9)
Fair value of plan assets, December 31		393.8	395.1	395.6
Funded status of plan		(134.4)	(113.4)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		4.9	9.4
Current liabilities		(3.5)	(3.0)
Non-current liabilities		(135.8)	(119.8)
Net amount		(134.4)	(113.4)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		163.7	144.2
Net prior service (credit) cost		0.8	0.7
Net amount	[1]	164.5	144.9
Defined Benefit Plan, Accumulated Benefit Obligation		505.5	486.2
U.S. other postretirement benefit plans [Member]
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		145.3	169.7
Service cost		0.2	0.2	0.3
Interest cost		4.0	5.7	6.7
Actuarial (gain) loss		(14.4)	(16.8)
Acquisition		0.0	1.7
Benefits paid and other		(15.2)	(15.2)
Projected benefit obligation, December 31		119.9	145.3	$ 169.7
Change in plan assets:
Funded status of plan		(119.9)	(145.3)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		0.0	0.0
Current liabilities		(14.5)	(16.8)
Non-current liabilities		(105.4)	(128.5)
Net amount		(119.9)	(145.3)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		19.9	36.5
Net prior service (credit) cost		(19.2)	(24.0)
Net amount	[1]	$ 0.7	$ 12.5

[1] AOCI shown above does not include our equity investee, NSK-Warner. NSK-Warner had an AOCI loss of $10.8 million and $7.1 million at December 31, 2016 and 2015, respectively.