Public Offering - Additional Information (Details) - USD ($)		12 Months Ended
	Sep. 11, 2018	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Units sold	40,000,000
Share price (in dollars per share)	$ 10.00
Proceeds from sale of Units in initial public offering		$ 400,000,000
Payment of underwriter's discounts and commissions		$ (8,000,000)
Percentage of deferred underwriting discount		3.50%
Deferred underwriting discount	$ (14,000,000)
IPO
Class Of Stock [Line Items]
Proceeds from sale of Units in initial public offering	$ 400,000,000
Upfront underwriting discount (as a percent)	2.00%
Payment of underwriter's discounts and commissions	$ (8,000,000)
Percentage of deferred underwriting discount		3.50%
Over-Allotment Option
Class Of Stock [Line Items]
Units sold	2,500,000
Warrant
Class Of Stock [Line Items]
Number of shares that contribute each unit		0.33
Warrant exercisable term if business combination is completed		30 days
Warrant exercisable term from the closing of public offer		12 months
Warrant expiration term		5 years
Number of months to complete business combination		24 months
Class A Common Stock
Class Of Stock [Line Items]
Sale of common stock (in shares)		40,000,000
Share price (in dollars per share)	$ 10.00
Number of shares that contribute each unit		1
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Number of shares warrant may be converted		1
Warrants exercise price (in dollars per share)		$ 11.50
Class A Common Stock | IPO
Class Of Stock [Line Items]
Sale of common stock (in shares)		40,000,000