Inventory (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Capitalized Pre Production Inventory [Roll Forward]
Total capitalized pre-production, Beginning Balance	$ 524.6	$ 553.2
Charges to costs and expenses	(64.8)	(59.7)
Capitalized costs (1)	26.4	31.1
Total capitalized pre-production, Ending Balance	$ 486.2	$ 524.6