Stockholders' Equity - Capital Stock, Cash Dividend and Share Repurchases (Details)				10 Months Ended	12 Months Ended
	May 21, 2020 $ / shares	Apr. 15, 2020 USD ($)	Apr. 16, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) vote $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Jun. 01, 2018 USD ($)
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares				750,000,000	750,000,000	750,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01
Preferred stock, authorized (in shares) | shares					1,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01
Votes per share | vote					1
Amount of cash dividend declared				$ 33,000,000	$ 39,000,000	$ 33,000,000
Dividends declared and paid					30,000,000
Payments of dividends			$ 8,000,000		$ 38,000,000	25,000,000	$ 0
Cash dividend per common share (in dollars per share) | $ / shares				$ 0.20	$ 0.24
Amount authorized in share repurchase program								$ 400,000,000
Value of stock repurchased during period				$ 60,000,000	$ 66,000,000
Payment for repurchase of common stock (less than)					66,000,000	$ 59,000,000	$ 0
Remaining shares authorized to be repurchased					$ 275,000,000
Subsequent Event
Class of Stock [Line Items]
Payments of dividends		$ 10,000,000
Cash dividend per common share (in dollars per share) | $ / shares	$ 0.07
Common Stock
Class of Stock [Line Items]
Number of shares repurchased during period (in shares) | shares					2,800,000	2,700,000
Value of stock repurchased during period					$ 65,000,000	$ 60,000,000