Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 113.1	$ 122.9
Adjustments to reconcile net income to
Deferred policy acquisition costs	(7.6)	(4.6)
Premiums and other receivables	(70.8)	(61.7)
Unpaid claims and related items	24.4	12.6
Unearned premiums and other policyholders' liabilities	50.5	8.3
Income taxes	56.5	57.2
Prepaid federal income taxes	(31.8)	(19.1)
Reinsurance balances and funds	42.3	30.0
Realized investment (gains) losses	(14.8)	(44.1)
Accounts payable, accrued expenses and other	(15.6)	24.4
Total	146.1	125.9
Available for sale
Maturities and early calls	139.8	250.6
Sales	107.9	70.5
Sales of:
Equity securities	40.3	252.7
Other - net	6.8	4.5
Purchases of:
Available for sale	(197.6)	(323.1)
Held to maturity	(87.3)	(157.4)
Equity securities	(95.9)	(233.9)
Other - net	(13.6)	(12.0)
Net decrease (increase) in short-term investments	27.2	19.2
Total	(72.3)	(128.8)
Cash flows from financing activities:
Proceeds from Other Debt	0.0	32.4
Issuance of common shares	11.1	1.8
Redemption of debentures and notes	(3.9)	(3.5)
Dividends on common shares	(49.3)	(48.3)
Other - net	0.0	(2.2)
Total	(42.2)	(19.8)
Increase (decrease) in cash	31.5	(22.7)
Cash, beginning of period	145.7	159.8
Cash, end of period	177.2	137.1
Supplemental cash flow information:
Cash paid (received) during the period for: Interest	30.9	20.1
Cash paid (received) during the period for: Income taxes	$ (5.0)	$ 1.8