Financial Instruments (Summary Of Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	$ (1,066.5)	$ (1,065.2)
Foreign currency contract obligations	6.4	5.2
Natural gas contracts	0.6	0.5
Interest rate swap contracts	(7.9)	(7.9)
Quoted, Active Markets Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	(470.8)	(470.9)
Foreign currency contract obligations	6.4	5.2
Other Observable Inputs Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	(595.7)	(594.3)
Natural gas contracts	0.6	0.5
Interest rate swap contracts	$ (7.9)	$ (7.9)