Consolidated Statements of Changes in Total Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Statement of Income and Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ 12.2	[1]	$ 0.6	[1]	$ (9.4)	[1]
Tax Expense On Deferred Stock Held					(0.1)	[1]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	8.2	[1]	(8.4)	[1]	(37.3)	[1]
Debt Instrument, Convertible, Effective Interest Rate					1.00%
Additional Paid-in Capital [Member]
Statement of Income and Comprehensive Income [Abstract]
Debt Instrument, Convertible, Effective Interest Rate					1.00%
Accumulated Other Comprehensive Income (Loss) [Member]
Statement of Income and Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	12.2		0.6		9.4
Tax Expense On Deferred Stock Held					0.1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	8.2		8.4		37.3
Parent [Member]
Statement of Income and Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	12.2		0.6		9.4
Tax Expense On Deferred Stock Held					0.1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	8.2		8.4		37.3
Debt Instrument, Convertible, Effective Interest Rate	1.00%		1.00%		1.00%
Noncontrolling Interest [Member]
Statement of Income and Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	12.2		0.6		9.4
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ 8.2		$ 8.4		$ 37.3

[1] See Note 22 -Restatement of Consolidated Financial Statements