Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The following summarizes the gross carrying value and accumulated amortization for each major category of intangible asset as of December 31 ($ in millions):

	2016					2015
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangibles:
Patents and technology	$	301.0	$	(240.1	)	$	296.3	$	(221.4	)
Customer relationships and other intangibles		731.9		(438.1	)		691.7		(386.4	)
Total finite-lived intangibles		1,032.9		(678.2	)		988.0		(607.8	)
Indefinite-lived intangibles:
Trademarks and trade names		392.6		—			378.8		—
Total intangibles	$	1,425.5	$	(678.2	)	$	1,366.8	$	(607.8	)

Schedule of Indefinite-Lived Intangible Assets

The following summarizes the gross carrying value and accumulated amortization for each major category of intangible asset as of December 31 ($ in millions):

	2016					2015
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangibles:
Patents and technology	$	301.0	$	(240.1	)	$	296.3	$	(221.4	)
Customer relationships and other intangibles		731.9		(438.1	)		691.7		(386.4	)
Total finite-lived intangibles		1,032.9		(678.2	)		988.0		(607.8	)
Indefinite-lived intangibles:
Trademarks and trade names		392.6		—			378.8		—
Total intangibles	$	1,425.5	$	(678.2	)	$	1,366.8	$	(607.8	)