XML 104 R74.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements Fair Value Measurements, Textual (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Net Asset (Liability) (11.1)us-gaap_FairValueNetAssetLiability $ (4.3)us-gaap_FairValueNetAssetLiability
Minimum    
Schedule of Available-for-sale Securities [Line Items]    
Short Term Investment Maturity Period 9 days  
Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Short Term Investment Maturity Period 15 months