Pensions And Other Postretirement Benefits (Effect Of Fair Value Measurements Using Significant Unobservable Inputs (Level 3) On Changes In Other Benefit Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended											12 Months Ended				12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Private Equity Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Private Equity Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Real Estate [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Real Estate [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Other Benefits [Member]	Dec. 31, 2010 Other Benefits [Member]	Dec. 31, 2009 Other Benefits [Member]	Dec. 31, 2011 Other Benefits [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Other Benefits [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Other Benefits [Member] Hedge Funds [Member]	Dec. 31, 2010 Other Benefits [Member] Hedge Funds [Member]	Dec. 31, 2011 Other Benefits [Member] Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Other Benefits [Member] Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Other Benefits [Member] Private Equity Funds [Member]	Dec. 31, 2010 Other Benefits [Member] Private Equity Funds [Member]	Dec. 31, 2011 Other Benefits [Member] Private Equity Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Other Benefits [Member] Private Equity Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Other Benefits [Member] Real Estate [Member]	Dec. 31, 2011 Other Benefits [Member] Real Estate [Member] Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 186.0	$ 143.1	$ 105.8	$ 71.4	$ 25.0	$ 18.2	$ 15.5	$ 14.4	$ 193.5	$ 174.2	$ 136.7	$ 28.9	$ 17.7	$ 28.3	$ 24.0	$ 24.0	$ 14.6	$ 8.7	$ 7.4	$ 4.9	$ 3.1	$ 10.2
Relating to assets still held at the reporting date	7.0	7.8	(2.4)	2.4	2.6	3.4	1.6	1.5				1.4	1.1			(0.4)	0.1			1.4	1.0		0.4
Purchases, sales and settlements		18.0		15.0		3.3		(0.4)					10.1				9.3				0.8
Purchases	40.2	17.0	35.8	17.0	4.4							18.4				7.7				0.9			9.8
Sales	(45.0)		(39.0)		(4.9)		(1.1)					(3.4)				(3.0)				(0.4)
Ending balance	$ 192.2	$ 186.0	$ 100.7	$ 105.8	$ 30.1	$ 25.0	$ 16.5	$ 15.5	$ 193.5	$ 174.2	$ 136.7	$ 45.3	$ 28.9	$ 28.3	$ 24.0	$ 28.3	$ 24.0	$ 8.7	$ 7.4	$ 6.8	$ 4.9	$ 10.2	$ 10.2