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Investments (Details) (Keymark Enterprises, LLC, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Keymark Enterprises, LLC |
Purchase of Keymark software assets |
Investment in Keymark, carrying value | $ 1.0
Software assets acquired | 11.5
Software assets acquired, net cash payments | 6.2
Ownership interest given up in exchange for software assets acquired (as a percent) | 46.10%
Gain on disposal of investment in Keymark | $ 4.3

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