Goodwill and Other Intangible Assets - Net (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The following table presents the changes in the carrying amount of goodwill (in millions):

	Amount
Balance—December 2019	$	67.2
Addition due to business combination	1.0
Balance—September 2020	$	68.2

Schedule of Finite-Lived Intangible Assets by Major Class

The following tables present other intangible assets—net as of September 30, 2020 and December 31, 2019 (in millions, except years):

	September 30, 2020
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Finite-lived intangible assets:
Developed technologies	4.0	$	53.3	$	30.2	$	23.1
Customer relationships	4.1	21.8		19.6		2.2
Total other intangible assets—net		$	75.1	$	49.8	$	25.3

	December 31, 2019
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Finite-lived intangible assets:
Developed technologies	4.0	$	50.2	$	24.6	$	25.6
Customer relationships	4.1	21.6		16.1		5.5
Total other intangible assets—net		$	71.8	$	40.7	$	31.1

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table summarizes estimated future amortization expense of finite-lived intangible assets—net (in millions):

	Amount
Years:
2020 (the remainder of 2020)	$	2.7
2021	9.6
2022	7.5
2023	4.8
2024	0.7
Total	$	25.3