Derivatives and Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of location and amount of gains and losses in statement of operations
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total	$ (0.1)	$ (0.6)		$ (0.9)
Derivatives not designated as hedging instruments under ASC 815 [Member] | Foreign exchange contracts [Member] | Other income and (expense), net [Member]
Summary of location and amount of gains and losses in statement of operations
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total	0.1	0.1	0.1
Derivatives not designated as hedging instruments under ASC 815 [Member] | Metal commodity contracts [Member] | Cost of materials sold [Member]
Summary of location and amount of gains and losses in statement of operations
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total	(0.2)	(0.7)	(0.1)	(0.8)
Derivatives not designated as hedging instruments under ASC 815 [Member] | Natural gas commodity contracts [Member] | Warehousing, delivery, selling, general and administrative [Member]
Summary of location and amount of gains and losses in statement of operations
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total				$ (0.1)