Debt (Other Long-term Debt) (Details) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended
	Dec. 31, 2004 USD ($)	Dec. 31, 2004 CHF	Sep. 30, 2014 Capital Lease Obligations [Member] CHF	Sep. 30, 2014 Information Technology [Member] USD ($)	Sep. 30, 2014 Other Capital Leases [Member] USD ($)	Dec. 31, 2004 Alcan [Member]	Sep. 30, 2014 Alcan [Member] USD ($)
Debt Instrument [Line Items]
Capital lease term						15 years
Weighted average interest rate						7.50%
Quarterly capital lease payments	$ 1.8	1.7
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments			30	$ 10	$ 5		$ 31