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Capital Structure - Share Repurchase Program (Details) - USD ($) shares in Millions		3 Months Ended		11 Months Ended
	Jul. 27, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Feb. 28, 2018
Class of Stock [Line Items]
Authorized repurchase amount	$ 100,000,000
Increase in authorized repurchase amount	$ 50,000,000
Value of shares repurchased		$ 8,805,000	$ 14,444,000
Class A
Class of Stock [Line Items]
Authorized repurchase amount					$ 50,000,000.0
Number of shares repurchased				2.6
Value of shares repurchased				$ 65,900,000
Remaining capacity for future purchases		$ 34,100,000

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