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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