Fair Value Measurements and Risk (Details) (USD $) In Millions, unless otherwise specified											3 Months Ended
	Jun. 30, 2014 country	Jun. 30, 2014	Jun. 30, 2014 Recurring basis Total	Dec. 31, 2013 Recurring basis Total	Jun. 30, 2014 Recurring basis Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Recurring basis Fair Value, Inputs, Level 1 [Member]	Jun. 30, 2014 Recurring basis Significant Other Observable Inputs (Level 2)	Dec. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2)	Jun. 30, 2014 Recurring basis Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Recurring basis Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2014 Fixed-rate natural gas swaps	Jun. 30, 2014 Commodity Option [Member] MMBTU	Jun. 30, 2014 Fixed-rate aluminum swaps lb
Items measured at Fair Value on a Recurring Basis
Maximum period of cash flow hedging											12 months	24 months	12 months
Nonmonetary Notional Amount of Price Risk Cash Flow Hedge Derivatives, Number of Units												4,500,000	1,500,000
Derivative, Notional Amount													$ 1.2
Number of countries where company does business, greater than	40	50
Assets
Currency derivatives, assets			2.2	2.1	0	0	2.2	2.1	0	0
Commodity derivatives, assets			0.1		0		0.1		0
Total Assets			2.3	2.1	0	0	2.3	2.1	0	0
Liabilities
Currency derivatives, liabilities			0.2	6.9	0	0	0.2	6.9	0	0
Interest Rate Derivative Liabilities, at Fair Value			2.8		0		2.8		0
Commodity derivatives, liabilities				0.1		0		0.1		0
Total Liabilities			$ 3.0	$ 7.0	$ 0	$ 0	$ 3.0	$ 7.0	$ 0	$ 0