Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill [Text Block]

	2018						2017
(millions of dollars)	Engine			Drivetrain			Engine			Drivetrain
Gross goodwill balance, January 1	$	1,359.6		$	1,024.2		$	1,324.0		$	880.2
Accumulated impairment losses, January 1	(501.8		)	(0.2		)	(501.8		)	(0.2		)
Net goodwill balance, January 1	$	857.8		$	1,024.0		$	822.2		$	880.0
Goodwill during the year:
Acquisitions*	—			1.7			—			125.8
Held for sale	—			—			(7.3		)	—
Translation adjustment and other	(16.5		)	(13.6		)	42.9			18.2
Ending balance, December 31	$	841.3		$	1,012.1		$	857.8		$	1,024.0

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* Acquisitions relate to the Company's 2017 purchase of Sevcon.

Intangible assets disclosure [Text Block]

	December 31, 2018						December 31, 2017
(millions of dollars)	Gross carrying amount		Accumulated amortization		Net carrying amount		Gross carrying amount		Accumulated amortization		Net carrying amount
Amortized intangible assets:
Patented and unpatented technology	$	151.9	$	60.7	$	91.2	$	157.7	$	52.9	$	104.8
Customer relationships	489.7		201.2		288.5		507.6		181.0		326.6
Miscellaneous	8.3		3.9		4.4		8.7		3.2		5.5
Total amortized intangible assets	649.9		265.8		384.1		674.0		237.1		436.9
Unamortized trade names	55.4		—		55.4		55.8		—		55.8
Total other intangible assets	$	705.3	$	265.8	$	439.5	$	729.8	$	237.1	$	492.7

Intangible assets gross roll forward [Text Block]

(millions of dollars)	2018			2017
Beginning balance, January 1	$	729.8		$	649.6
Acquisitions*	—			72.6
Held for sale	—			(32.7		)
Translation adjustment	(24.5		)	40.3
Ending balance, December 31	$	705.3		$	729.8

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* Acquisitions primarily relate to the Company's 2017 purchase of Sevcon.

Accumulated amortization net [Text Block]

(millions of dollars)	2018			2017
Beginning balance, January 1	$	237.1		$	186.1
Amortization	40.1			40.0
Held for sale	—			(11.6		)
Translation adjustment	(11.4		)	22.6
Ending balance, December 31	$	265.8		$	237.1