Earnings (Loss) Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 56.2	$ 9.7	$ 31.7	$ (103.5)	$ (56.0)	$ (208.3)	$ 97.6	$ (367.8)
Weighted-average numb er of ordinary shares outstanding - basic (in shares)	352,482,900			328,411,705			351,439,095	299,266,849
Dilutive effect of equity-based compensation and warrants (in shares)	10,715,801			0			4,535,533	0
Weighted-average number of ordinary shares outstanding - diluted (in shares)	363,198,701			328,411,705			355,974,628	299,266,849
Net income per share attributable to common shareholders
Basic (USD per share)	$ 0.16			$ (0.32)			$ 0.28	$ (1.23)
Diluted (USD per share)	$ 0.15			$ (0.32)			$ 0.27	$ (1.23)