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Commitments and Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]      
Percentage of capital committed to strategic investments that may be drawn down 100.00%    
Total operating lease expense $ 6.1 $ 6.5 $ 7.2
Letters of credit issued 3.7    
Legal settlement payment   $ 2.0