Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended				12 Months Ended
	Feb. 25, 2011	Mar. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Minimum	Dec. 31, 2012 Minimum Land improvements	Dec. 31, 2012 Minimum Buildings	Dec. 31, 2012 Minimum Machinery and equipment	Dec. 31, 2012 Minimum Software and Software Development Costs [Member]	Dec. 31, 2012 Maximum	Dec. 31, 2012 Maximum Land improvements	Dec. 31, 2012 Maximum Buildings	Dec. 31, 2012 Maximum Machinery and equipment	Dec. 31, 2012 Maximum Internet Website Costs [Member]	Dec. 31, 2012 Maximum Software and Software Development Costs [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Stock split conversion ratio (as a ratio)	2	2	2
Unbilled receivables				$ 627.7	$ 411.8
Available-for-sale securities				0	0
Trading securities				35.6	32.8
Property, plant and equipment, useful life							20 years	20 years	3 years			35 years	50 years	20 years
Capitalized software				$ 50.8	$ 33.8
Intangible assets, useful life						7 years				3 years	40 years				3 years	10 years