Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

The following table provides the gross carrying value and accumulated amortization for each major class of intangible asset at September 30, 2021 and December 31, 2020 (in millions):

	September 30, 2021						December 31, 2020
	Gross Carrying Value		Accumulated Amortization		Net Book Value		Gross Carrying Value		Accumulated Amortization		Net Book Value
Customer relationships	$	100.0	$	(19.2)	$	80.8	$	97.7	$	(14.7)	$	83.0
Technology	215.5		(24.8)		190.7		101.7		(13.6)		88.1
Tradename	1.0		(0.1)		0.9		—		—		—
Total intangible assets	$	316.5	$	(44.1)	$	272.4	$	199.4	$	(28.3)	$	171.1

Schedule of Estimated Annual Amortization Expense

Estimated annual amortization expense related to intangible assets with definite lives as of September 30, 2021 is as follows (in millions):

Remainder of 2021	$	7.1
2022	28.4
2023	28.4
2024	26.5
2025	24.9
2026	24.9
Thereafter	132.2
Total	$	272.4