Inventory (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Capitalized Pre Production Inventory [Abstract]
Total capitalized pre-production, Beginning Balance	$ 553.2	$ 541.8
Charges To Costs And Expenses Pre Production Inventory	(59.7)	(70.5)
Capitalized Costs Pre Production Inventory	31.1	81.9
Total capitalized pre-production, Ending Balance	$ 524.6	$ 553.2