Other Retirement Plans (Multi-Employer Plan Contributions And Number Of Employees) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Contributions to Multi-Employer Plans	$ 20.7	[1]	$ 22.6	$ 5.1
Multi-Employer Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of Employees	1,538		1,111	1,409
Multi-Employer Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of Employees	308		254	66

[1] For the plans listed above, the Company is not aware of any current surcharge payments.