Loss per share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Summary of Computation of Loss Per Share

The computation of loss per share for the respective periods is as follows

		2019				2018				2017
		(in € millions, except share and per share data)
Basic loss per share
Net loss attributable to owners of the parent			(186	)			(78	)			(1,235	)
Shares used in computation:
Weighted-average ordinary shares outstanding			180,960,579				177,154,405				151,668,769
Basic net loss per share attributable to owners of the parent			(1.03	)			(0.44	)			(8.14	)

Diluted loss per share
Net loss attributable to owners of the parent			(186	)			(78	)			(1,235	)
Fair value adjustments on warrants			—				(14	)			—
Net loss used in the computation of diluted loss per share			(186	)			(92	)			(1,235	)
Shares used in computation:
Weighted-average ordinary shares outstanding			180,960,579				177,154,405				151,668,769
Warrants			—				4,055,887				—
Diluted weighted average ordinary shares			180,960,579				181,210,292				151,668,769
Diluted net loss per share attributable to owners of the parent			(1.03	)			(0.51	)			(8.14	)

Summary of Anti-dilutive Securities

Potential dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

		2019				2018				2017
Employee options			12,153,772				12,243,526				14,646,720
Restricted stock units			638,350				100,383				195,937
Restricted stock awards			41,280				61,880				61,880
Other contingently issuable shares			162,320				—				—
Warrants			2,400,000				—				6,720,000