Quarterly Financial Information (Long-Term Software Contract) (Details) (Software [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Out-of-period impact expense (revenue) adjustment		$ (1.1)
Net Revenue [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Out-of-period impact expense (revenue) adjustment	2.0	4.2
Cost of Goods Sold [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Out-of-period impact expense (revenue) adjustment	$ (0.9)	$ (3.1)