Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Premiums	$ 1,263.6	$ 1,181.3
Net investment income	82.9	71.1
Net realized and unrealized investment gains (losses):
Net realized gains from sales and other	0.3	3.3
Net change in fair value of equity securities	(23.0)
Net other–than–temporary impairment losses on investments recognized in earnings	(0.7)	(1.4)
Total net realized and unrealized investment (losses) gains	(23.4)	1.9
Fees and other income	7.8	6.6
Total revenues	1,330.9	1,260.9
Losses and expenses
Losses and loss adjustment expenses	785.8	766.5
Amortization of deferred acquisition costs	288.0	266.4
Interest expense	12.4	12.0
Other operating expenses	164.1	157.0
Total losses and expenses	1,250.3	1,201.9
Income before income taxes	80.6	59.0
Income tax expense (benefit):
Current	20.2	33.9
Deferred	(7.4)	(20.1)
Total income tax expense	12.8	13.8
Income from continuing operations	67.8	45.2
Net loss from discontinued operations (net of tax benefit of $0.1 for the three months ended March 31, 2018).	(0.1)
Net income	$ 67.7	$ 45.2
Basic:
Income from continuing operations	$ 1.59	$ 1.06
Net income per share	$ 1.59	$ 1.06
Weighted average shares outstanding	42.5	42.5
Diluted:
Income from continuing operations	$ 1.57	$ 1.05
Net income per share	$ 1.57	$ 1.05
Weighted average shares outstanding	43.1	42.9