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Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Net loss	$ (484.9)	$ (111.7)	$ (210.2)
Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share (in shares)	358.6	195.9	189.1
Net loss per common share, basic and diluted (in dollars per share)	$ (1.35)	$ (0.57)	$ (1.11)
Class A
Class of Stock [Line Items]
Net loss	$ (138.7)	$ (3.6)	$ (6.1)
Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share (in shares)	102.6	6.3	5.5
Net loss per common share, basic and diluted (in dollars per share)	$ (1.35)	$ (0.57)	$ (1.11)
Class B
Class of Stock [Line Items]
Net loss	$ (346.2)	$ (108.1)	$ (204.1)
Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share (in shares)	256.0	189.6	183.6
Net loss per common share, basic and diluted (in dollars per share)	$ (1.35)	$ (0.57)	$ (1.11)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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