Stock-Based Incentive Compensation Plans (Details) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Stock options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	33,292	903,502
Performance Shares [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	11,698	306,456
Stock Appreciation Rights [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	0	80,225
Restricted Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	44,191	730,421
Non-employee Agent Stock Options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	0	99,113
Non-employee Director Stock Options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	0	51,140
Non-employee Director Restricted Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	11,037	33,383