CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Millions, unless otherwise specified	Total	Common shareholders' equity.	Common shares and paid-in surplus	Retained earnings	Accum. Other comprehensive income (loss),after-tax	Non-controlling interest
Balances at Dec. 31, 2010		$ 3,653.0	$ 1,359.0	$ 2,175.6	$ 118.4	$ 607.8
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(11.1)	(32.3)	0	(32.3)	0	21.2
Other comprehensive income, after-tax		52.0	0	0	52.0	0
Dividends declared on common shares		(8.0)	0	(8.0)	0	0
Dividends to noncontrolling interests		0	0	0	0	(47.2)
Repurchases and retirements of common shares	(93.2)	(229.8)	(98.5)	(131.3)	0	0
Issuances of common shares		0.9	0.9	0	0	0
Net distributions to noncontrolling interests		0	0	0	0	(7.7)
Amortization of restricted share and option awards		8.9	8.9	0	0	0.3
Balances at Sep. 30, 2011		3,444.7	1,270.3	2,004.0	170.4	574.4
Balances at Dec. 31, 2011	4,667.9	4,087.7	1,261.3	2,789.7	36.7	580.2
Increase (Decrease) in Shareholders' Equity
Net income (loss)	137.2	139.2	0	139.2	0	(2.0)
Other comprehensive income, after-tax		93.0	0	0	93.0	(0.4)
Dividends declared on common shares		(6.6)	0	(6.6)	0	0
Dividends to noncontrolling interests		0	0	0	0	(24.5)
Repurchases and retirements of common shares	(107.6)	(517.5)	(172.6)	(344.9)	0	0
Issuances of common shares		5.8	5.8	0	0	0
Net distributions to noncontrolling interests		0	0	0	0	13.0
Amortization of restricted share and option awards		9.9	9.9	0	0	0.6
Fair Value of Net Assets Acquired		(2.2)	(2.2)	0	0	2.2
Balances at Sep. 30, 2012	$ 4,378.4	$ 3,809.3	$ 1,102.2	$ 2,577.4	$ 129.7	$ 569.1