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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Carrying Amount of Goodwill, by Segment
The changes in the carrying amount of goodwill, by segment, during the years ended December 31, 2020 and 2019 were as follows:
 United
States
EuropeRest of WorldTotal
 (in millions)
Goodwill at December 31, 2018$709.3 $64.2 $338.7 $1,112.2 
Goodwill acquired during the year64.4 — — 64.4 
Currency translation adjustment— (1.4)(7.5)(8.9)
Goodwill at December 31, 2019773.7 62.8 331.2 1,167.7 
Currency translation adjustment— 5.5 — 5.5 
Goodwill at December 31, 2020$773.7 $68.3 $331.2 $1,173.2 
Schedule of Finite-Lived Other Intangible Assets
Other intangible assets consist of the following (in millions):

 December 31,
 Weighted-Average Useful Life (in years)20202019
 CostAccumulated
Amortization
Net
Carrying
Value
CostAccumulated
Amortization
Net
Carrying
Value
Finite-lived intangible assets      
Patents7.4$186.1 $(183.6)$2.5 $185.7 $(182.1)$3.6 
Developed technology13.1155.2 (51.0)104.2 153.5 (46.6)106.9 
Other10.012.6 (6.0)6.6 12.3 (4.4)7.9 
12.6353.9 (240.6)113.3 351.5 (233.1)118.4 
Indefinite-lived intangible assets      
In-process research and development218.1 — 218.1 218.1 — 218.1 
$572.0 $(240.6)$331.4 $569.6 $(233.1)$336.5 
Schedule of Indefinite-Lived Other Intangible Assets
Other intangible assets consist of the following (in millions):

 December 31,
 Weighted-Average Useful Life (in years)20202019
 CostAccumulated
Amortization
Net
Carrying
Value
CostAccumulated
Amortization
Net
Carrying
Value
Finite-lived intangible assets      
Patents7.4$186.1 $(183.6)$2.5 $185.7 $(182.1)$3.6 
Developed technology13.1155.2 (51.0)104.2 153.5 (46.6)106.9 
Other10.012.6 (6.0)6.6 12.3 (4.4)7.9 
12.6353.9 (240.6)113.3 351.5 (233.1)118.4 
Indefinite-lived intangible assets      
In-process research and development218.1 — 218.1 218.1 — 218.1 
$572.0 $(240.6)$331.4 $569.6 $(233.1)$336.5 
Schedule of Estimated Amortization Expense Estimated amortization expense for each of the years ending December 31 is as follows (in millions):
2021$5.2 
20227.6 
202310.1 
202412.2 
202514.8