Debt (Summary Of Interest Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt [Abstract]
Interest incurred	$ 259.8	$ 233.3	$ 246.6
Less: interest income	(13.6)	(9.1)	(9.9)
Less: interest capitalized as property, plant and equipment	(2.9)	(1.6)	(2.1)
Interest expense, net	$ 243.3	$ 222.6	$ 234.6