Commitments And Contingencies (Other Contingencies) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended						12 Months Ended				12 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2011 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2008 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2010 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2009 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2007 Environmental Claims For A Site In Goodyear Arizona [Member]	Jul. 31, 2006 Environmental Claims For A Site In Goodyear Arizona [Member]	Dec. 31, 2011 Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member]	Dec. 31, 2011 Environmental Claims For Site In Roseland New Jersey [Member]	Apr. 15, 2011 Environmental Claims For Site In Roseland New Jersey [Member]	Jan. 08, 2010 Merrimac Securities Class Action Lawsuit [Member]	Dec. 31, 2011 Negligence Lawsuit Rising From Fire Damage [Member] lawsuits	Jul. 01, 2009 Fiberglass-Reinforced Plastic Material [Member]	Jan. 31, 2009 Fiberglass-Reinforced Plastic Material [Member]	Dec. 31, 2009 Fiberglass-Reinforced Plastic Material [Member]
Loss Contingencies [Line Items]
Estimated liability	$ 66.0	$ 65.2	$ 40.5	$ 53.8	$ 41.5
Additional charge	30.3	24.3
Accrued environmental loss contingencies, current portion of total gross estimated liability	16.0
Other receivables	13.7
Stock price per share										$ 16.00
Damages sought													9.5
Estimate of lost profits											260		55
Settlement cost												17.75
Approximate size of referenced site, acres							55,000
Number of separate lawsuits consolidated into one lawsuit											5
Approximate number of homes tested for contaminants								40
Number of homes where contaminants were found									3
Number of tenants who filed a separate lawsuit									1
Number of members in the purported class								142
Loss contingency reimbursement rate						21.00%
Net Pre-tax Charge														$ 7.25