Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Net premiums earned	$ 1,192.6	$ 1,158.2	$ 2,343.5	$ 2,261.2
Title, escrow, and other fees	121.3	115.2	216.1	206.7
Total premiums and fees	1,313.9	1,273.5	2,559.6	2,467.9
Net investment income	94.9	93.1	191.2	184.6
Other income	26.6	26.5	53.9	52.0
Total operating revenues	1,435.5	1,393.3	2,804.9	2,704.6
Realized investment gains (losses):
From sales	6.6	16.6	50.8	35.5
From impairments	0.0	0.0	0.0	0.0
Total realized investment gains (losses)	6.6	16.6	50.8	35.5
Total revenues	1,442.2	1,410.0	2,855.7	2,740.2
Benefits, Claims and Expenses:
Benefits, claims and settlement expenses	587.2	604.4	1,157.0	1,169.2
Dividends to policyholders	5.5	3.6	9.8	9.0
Underwriting, acquisition, and other expenses	689.9	639.7	1,336.3	1,235.5
Interest and other charges	10.6	10.2	21.3	20.7
Total expenses	1,293.4	1,258.1	2,524.6	2,434.6
Income before income taxes (credits)	148.8	151.8	331.1	305.6
Income Taxes (Credits):
Current	38.6	46.4	95.8	95.4
Deferred	9.0	3.3	11.3	4.6
Total	47.7	49.7	107.1	100.0
Net Income	$ 101.0	$ 102.0	$ 224.0	$ 205.5
Net Income Per Share:
Net income (loss) per share: Basic (in dollars per share)	$ 0.39	$ 0.39	$ 0.87	$ 0.79
Net income (loss) per share: Diluted (in dollars per share)	$ 0.35	$ 0.36	$ 0.78	$ 0.72
Average shares outstanding: Basic (in shares)	259,093,314	259,468,711	258,998,523	259,371,887
Average shares outstanding: Diluted (in shares)	296,069,028	295,987,501	295,923,078	295,852,949
Dividends Per Common Share:
Cash	$ 0.1875	$ 0.1850	$ 0.3750	$ 0.3700