Consolidated Statements of (Loss) Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Net earned insurance and reinsurance premiums	$ 1,262.3	$ 1,035.3	$ 890.1
Net investment income	71.4	56.8	56.2
Net realized investment gains (losses)	2.3	(27.2)	288.3
Net unrealized investment gains (losses)	(23.2)	(10.5)	(238.2)
Net foreign exchange gains (losses)	22.7	9.2	(11.0)
Gain on revaluation of contingent consideration	9.6	48.8
Other revenue	112.7	21.7	9.1
Total revenues	1,457.8	1,134.1	994.5
Expenses
Loss and loss adjustment expenses	900.0	811.2	519.3
Insurance and reinsurance acquisition expenses	255.4	197.2	210.3
Other underwriting expenses	146.2	106.1	107.3
General and administrative expenses	77.9	91.9	85.1
Intangible asset amortization expenses	15.8	10.2
Impairment of intangible assets	8.0	5.0
Interest expense on debt	30.8	22.4	34.6
Total expenses	1,434.1	1,244.0	956.6
Pre-tax income (loss)	23.7	(109.9)	37.9
Income tax (expense) benefit	(40.4)	(26.4)	7.3
(Loss) income before equity in earnings of unconsolidated affiliates	(16.7)	(136.3)	45.2
Equity in earnings of unconsolidated affiliates, net of tax			6.6
Net (loss) income	(16.7)	(136.3)	51.8
Less: Income attributable to non-controlling interests	(1.4)	(13.7)	(19.3)
Net (loss) income attributable to Sirius Group	(18.1)	(150.0)	32.5
Less: Accrued dividends on Series A redeemable preference shares	(2.6)	(6.1)
Less: Change in carrying value of Series B preference shares	(36.4)
Add: Redemption of Series A redeemable preference shares	13.8
Net (loss) income attributable to Sirius Group's common shareholders	$ (43.3)	$ (156.1)	$ 32.5
Net (loss) income per common share and common share equivalent
Basic earnings per common share and common share equivalent	$ (0.36)	$ (1.30)	$ 0.27
Diluted earnings per common share and common share equivalent	$ (0.36)	$ (1.30)	$ 0.27
Weighted average number of common shares and common share equivalents outstanding:
Basic weighted average number of common shares and common share equivalents outstanding	119,253,924	120,000,000	120,000,000
Diluted weighted average number of common shares and common share equivalents outstanding	119,253,924	120,000,000	120,000,000