Consolidated Statements of (Loss) Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Net earned insurance and reinsurance premiums	$ 434.7	$ 311.9
Net investment income	13.5	20.1
Net realized investment gains	20.3	9.0
Net unrealized investment (losses) gains	(43.8)	74.0
Net foreign exchange gains	18.5	5.1
Other revenue	4.3	19.6
Total revenues	447.5	439.7
Expenses
Loss and loss adjustment expenses	427.1	183.9
Insurance and reinsurance acquisition expenses	74.7	63.3
Other underwriting expenses	38.0	35.3
General and administrative expenses	32.1	24.4
Intangible asset amortization expenses	3.9	3.9
Interest expense on debt	7.8	7.6
Total expenses	583.6	318.4
Pre-tax (loss) income	(136.1)	121.3
Income tax benefit (expense)	14.8	(17.2)
Net (loss) income	(121.3)	104.1
Income attributable to non-controlling interests	(0.2)	(0.4)
(Loss) income attributable to Sirius Group	(121.5)	103.7
Change in carrying value of Series B preference shares	23.4	(8.4)
Net (loss) income attributable to Sirius Group's common shareholders	$ (98.1)	$ 95.3
Net (loss) income per common share and common share equivalent
Basic earnings per common share and common share equivalent (in usd per share)	$ (0.85)	$ 0.75
Diluted earnings per common share and common share equivalent (in usd per share)	$ (0.96)	$ 0.74
Weighted average number of common shares and common share equivalents outstanding:
Basic weighted average number of common shares and common share equivalents outstanding (in shares)	115,262,302	115,182,331
Diluted weighted average number of common shares and common share equivalents outstanding (in shares)	127,163,972	127,335,314