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Share Based Compensation Plans (Details 6) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Fair value of liability cash-settled stock appreciation rights |  |  |
Balance at January 1 | $ 2.2 | $ 0.8 | $ 0.2
Compensation charge | 5.8 | 1.4 | 0.6
Cash paid | (6.7) | 0 | 0
Balance at December 31 | $ 1.3 | $ 2.2 | $ 0.8

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