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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill The following is a rollforward of our goodwill by segment ($ in millions):
 
Professional Instrumentation
 
Industrial Technologies
 
Total
Balance, January 1, 2017
$
2,423.7

 
$
1,021.4

 
$
3,445.1

Attributable to 2017 acquisitions
851.8

 
183.4

 
1,035.2

Foreign currency translation & other
55.5

 
24.5

 
80.0

Balance, December 31, 2017
3,331.0

 
1,229.3

 
4,560.3

Attributable to 2018 acquisitions
1,571.8

 
29.4

 
1,601.2

Foreign currency translation & other
(8.2
)
 
(20.2
)
 
(28.4
)
Balance, December 31, 2018
$
4,894.6

 
$
1,238.5

 
$
6,133.1
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):
 
2018
 
2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
Finite-lived intangibles:
 
 
 
 
 
 
 
Patents and technology
$
614.0

 
$
(280.8
)
 
$
373.9

 
$
(252.4
)
Customer relationships and other intangibles
2,204.2

 
(589.9
)
 
1,214.7

 
(495.5
)
Total finite-lived intangibles
2,818.2

 
(870.7
)
 
1,588.6

 
(747.9
)
Indefinite-lived intangibles:
 
 
 
 
 
 
 
Trademarks and trade names
528.8

 
—

 
415.7

 
—

Total intangibles
$
3,347.0

 
$
(870.7
)
 
$
2,004.3

 
$
(747.9
)
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):
 
2018
 
2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Gross Carrying Amount
 
Accumulated Amortization
Finite-lived intangibles:
 
 
 
 
 
 
 
Patents and technology
$
614.0

 
$
(280.8
)
 
$
373.9

 
$
(252.4
)
Customer relationships and other intangibles
2,204.2

 
(589.9
)
 
1,214.7

 
(495.5
)
Total finite-lived intangibles
2,818.2

 
(870.7
)
 
1,588.6

 
(747.9
)
Indefinite-lived intangibles:
 
 
 
 
 
 
 
Trademarks and trade names
528.8

 
—

 
415.7

 
—

Total intangibles
$
3,347.0

 
$
(870.7
)
 
$
2,004.3

 
$
(747.9
)