Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 29, 2012	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of days used to compute performance period average closing price of restricted stock units		20
Performance-based restricted stock shares	0.5
Restricted stock, vesting period, in years	three
Percentage of pre-tax earnings paid for profit sharing plan		15.00%
Share-based compensation program pre-tax profits excluding special items, profit sharing expense and share-based compensation program expense threshold		$ 10
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based restricted stock units	0.6
Performance-Based Restricted Stock Units ("RSUs") Based On Return On Invested Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based restricted stock units	1.3