Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Net earned insurance and reinsurance premiums	$ 311.9	$ 284.5
Net investment income	20.1	10.8
Net realized investment gains (losses)	9.0	(3.7)
Net unrealized investment gains	74.0	16.0
Net foreign exchange gains (losses)	5.1	(3.5)
Other revenue	19.6	23.4
Total revenues	439.7	327.5
Expenses
Loss and loss adjustment expenses	183.9	141.0
Insurance and reinsurance acquisition expenses	63.3	63.0
Other underwriting expenses	35.3	43.2
General and administrative expenses	24.4	14.3
Intangible asset amortization expenses	3.9	3.9
Interest expense on debt	7.6	7.7
Total expenses	318.4	273.1
Pre-tax income	121.3	54.4
Income tax (expense)	(17.2)	(11.1)
Net income	104.1	43.3
Less: income attributable to non-controlling interests	(0.4)	(0.2)
Net income attributable to Sirius Group	103.7	43.1
Less: Change in carrying value of Series B preference shares	(8.4)
Less: Accrued dividends on Series A redeemable preference shares		(2.6)
Net income attributable to Sirius Group's common shareholders	$ 95.3	$ 40.5
Net income per common share and common share equivalent
Basic earnings per common share and common share equivalent	$ 0.75	$ 0.32
Diluted earnings per common share and common share equivalent	$ 0.74	$ 0.32
Weighted average number of common shares and common share equivalents outstanding
Basic weighted average number of common shares and common share equivalents outstanding	115,182,331	120,000,000
Diluted weighted average number of common shares and common share equivalents outstanding	127,335,314	120,000,000