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Capital Structure - Secondary Offerings (Details) - Class A	1 Months Ended
	May 31, 2018 $ / shares shares
Class of Stock [Line Items]
Number of shares issued (in shares)	17,250,000
Purchase price per share (in dollars per share) | $ / shares	$ 27.16
Offering price per share (in dollars per share) | $ / shares	$ 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

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