Capital Structure - Secondary Offerings (Details) - Class A - $ / shares	1 Months Ended
	May 31, 2018	May 31, 2019
Class of Stock [Line Items]
Number of shares issued (in shares)	17,250,000	9,000,000
Purchase price per share (in dollars per share)	$ 27.16	$ 22.00
Offering price per share (in dollars per share)	$ 28.00
Number of shares of stock issued (in shares)	10,518,750
Selling Stockholders
Class of Stock [Line Items]
Number of shares of stock issued (in shares)	6,731,250
Number of shares issued upon exercise of stock options (in shares)	2,081,250