XML 20 R33.htm IDEA: XBRL DOCUMENT v2.4.1.9
Investments in Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Marketable Securities [Abstract]    
Investments in marketable securities $ 192.9us-gaap_MarketableSecurities $ 172.6us-gaap_MarketableSecurities