Quarterly report pursuant to Section 13 or 15(d)

Available-For-Sale-Investments - Additional Information (Detail)

v2.4.0.8
Available-For-Sale-Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, fair value $ 239.0 $ 302.0
Available-for-sale securities, amortized cost 233.0 241.0
Chemo Centryx, Inc.
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, fair value 35.2 89.6
Available-for-sale securities, amortized cost $ 29.5 $ 29.5