Financial Instruments (Summary Of Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt, including current portion	$ (1,065.2)	$ (1,075.9)
Foreign currency		(1.8)
Natural gas contracts	0.5	(2.7)
Interest rate swap contracts	(7.9)	(25.7)
Quoted, Active Markets Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt, including current portion	(470.9)	(792.4)
Foreign currency	5.2	(1.8)
Other Observable Inputs Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt, including current portion	(594.3)	(283.5)
Natural gas contracts	0.5	(2.7)
Interest rate swap contracts	$ (7.9)	$ (25.7)