Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Basic and diluted net loss per share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Numerator:
Net loss attributable to common stockholders ($ in millions)	$	(66.4)	$	(30.9)	$	(171.0)	$	(88.4)
Denominator:
Weighted average common shares outstanding — basic and diluted	61,580,145		53,997,315		61,086,238		25,935,362
Net loss per share attributable to common stockholders — basic and diluted	$	(1.08)	$	(0.57)	$	(2.80)	$	(3.41)