Earnings (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 9.7	$ 31.7	$ (56.0)	$ (208.3)	$ 41.4	$ (264.3)
Weighted-average numb er of ordinary shares outstanding - basic (in shares)	352,199,184		328,411,705		350,908,612	284,534,285
Dilutive effect of equity-based compensation and warrants (in shares)	4,453,627		0		3,975,257	0
Weighted-average number of ordinary shares outstanding - diluted (in shares)	356,652,811		328,411,705		354,883,869	284,534,285
Net income per share attributable to common shareholders
Basic (USD per share)	$ 0.03		$ (0.17)		$ 0.12	$ (0.93)
Diluted (USD per share)	$ 0.03		$ (0.17)		$ 0.12	$ (0.93)