Consolidated Statements of Changes in Total Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2009		Dec. 31, 2009 Additional Paid-in Capital [Member]		Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member]		Dec. 31, 2010 Accumulated Other Comprehensive Income (Loss) [Member]		Dec. 31, 2009 Accumulated Other Comprehensive Income (Loss) [Member]		Dec. 31, 2011 Parent [Member]		Dec. 31, 2010 Parent [Member]		Dec. 31, 2009 Parent [Member]		Dec. 31, 2011 Noncontrolling Interest [Member]		Dec. 31, 2010 Noncontrolling Interest [Member]		Dec. 31, 2009 Noncontrolling Interest [Member]		Dec. 31, 2008 Noncontrolling Interest [Member] Effect of Restatement 2 [Member]
Statement of Income and Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ (9.4)	[1]			$ 12.2	[1]	$ 0.6	[1]	$ 9.4	[1]	$ 12.2	[1]	$ 0.6	[1]	$ 9.4	[1]	$ 12.2	[1]	$ 0.6	[1]	$ 9.4	[1]
Company deferred stock held in rabbi trust gain, tax	(0.1)	[1]							0.1	[1]					0.1	[1]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(37.3)	[1]			8.2	[1]	8.4	[1]	37.3	[1]	8.2	[1]	8.4	[1]	37.3	[1]	8.2	[1]	8.4	[1]	37.3	[1]
Debt Instrument, Convertible, Effective Interest Rate	1.00%	[1]	1.00%	[1]							1.00%	[1]	1.00%	[1]	1.00%	[1]
Accumulated other comprehensive loss																	(22.1)		(16.1)
Comprehensive income (loss), net of tax	$ 196.6	[1]									$ (55.4)		$ 86.2		$ 173.9		$ (5.1)		$ (12.8)		$ 22.7		$ 0.1

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