Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 113.8		$ 122.0
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	27.4		30.7
Share-based payments expense	11.1		20.8
Excess tax benefit from share-based payment arrangements	(0.1)		(0.6)
Deferred income tax provision, net	2.3		13.8
Net realized investment and other gains	(12.8)		(20.4)
Undistributed earnings from alternative investment portfolio	(20.8)		(4.6)
Amortization of debt issuance costs	0.1		0.1
Loss on disposals of fixed assets, net	0.2		0.2
Change in:
Accrued investment income	(0.3)		1.1
Receivables	(255.5)		(162.2)
Deferred acquisition costs	(14.9)		(17.6)
Ceded unearned premiums	(59.8)		(58.5)
Reserves for losses and loss adjustment expenses	154.2		75.9
Unearned premiums	120.3		123.0
Ceded reinsurance payable and funds held	128.3		134.3
Income taxes	19.7		(2.3)
Accrued underwriting expenses	(27.4)		(19.7)
Other, net	(35.1)		(0.2)
Cash provided by operating activities	150.7		235.8
Cash flows from investing activities:
Sales of fixed maturity investments	761.8		609.8
Maturities and mandatory calls of fixed maturity investments	839.0		637.4
Sales of equity securities	155.3		61.6
Sales of other investments	92.1		57.4
Purchases of fixed maturity investments	(1,650.7)		(1,303.4)
Purchases of equity securities	(114.7)		(97.9)
Purchases of other investments	(90.3)		(67.2)
Change in foreign regulatory deposits and voluntary pools	4.8		7.5
Change in short-term investments	(78.7)		(69.9)
Settlements of foreign currency exchange forward contracts	(7.2)		(6.7)
Purchases of fixed assets	(26.7)		(22.0)
Other, net	31.9		17.4
Cash used in investing activities	(83.4)		(176.0)
Cash flows from financing activities:
Activity under stock incentive plans	0.6		1.5
Repurchase of Company's common shares	(45.3)		(29.7)
Excess tax expense from share-based payment arrangements	0.1		0.6
Payment of cash dividends to common shareholders	(19.8)		(17.1)
Cash used in financing activities	(64.4)		(44.7)
Effect of exchange rate changes on cash	(1.0)		0.1
Change in cash	1.9		15.2
Cash, beginning of period	121.7	[1]	81.0
Cash, end of period	$ 123.6		$ 96.2

[1] Derived from audited consolidated financial statements.