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Number of shares authorized for issuance under share-based payment arrangement.

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Employment and Compensation Arrangements - 2019 Transaction Related Awards (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended		17 Months Ended
	Aug. 14, 2019	May 13, 2019	Mar. 12, 2019	Mar. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average risk-free interest rate	1.42%	2.20%
Expected volatility rate	20.00%	20.00%
Weighted-average expected dividend yield	0.00%	0.00%
Share-based compensation expense					$ 6,796	$ 9,567	$ 31,121	$ 46,675	$ 25,013
Number of nonvested shares (in shares)		5,309,713
Vesting period		3 years		3 years			5 years
Awards vested limit, before second anniversary					33.00%		33.00%		33.00%
Awards vested limit, before third anniversary					66.00%		66.00%		66.00%
Merger shares expense									$ 48,102
Stock issuance cost for stock with time vesting conditions									1,193
Cost related to founder shares									4,411
Cost offset related to warrants									6,297
Shares issued (in shares)			1,500,000
Proceeds from issuance of ordinary shares							$ 843,752	$ 0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount or lack of marketability	3.00%	3.00%
Lock-up period following merger	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount or lack of marketability	7.00%	7.00%
Lock-up period following merger	3 years
Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of ordinary shares			$ 15,000
Vesting Price Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost offset from performance vesting shares									13,101
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Performance Shares \| Vesting Price One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost offset from performance vesting shares									$ 9,396
Vesting price (usd per share)		$ 15.25
Performance Shares \| Vesting Price Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting price (usd per share)		17.50
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (usd per share)		$ 15.25
Number of nonvested shares (in shares)		2,654,856
Period after closing for sale price of share		42 months
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (usd per share)		$ 17.50								$ 17.50
Number of nonvested shares (in shares)		2,654,856								17,265,826
Transaction Related Awards 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuable shares (in shares)		7,000,000
Share price (usd per share)		$ 20.00
Weighted-average risk-free interest rate		1.33%
Expected volatility rate		20.00%
Weighted-average expected dividend yield		0.00%
Share-based compensation expense					$ 0		$ 13,720