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Balance Sheet Accounts - Summary of Cash and Cash Equivalents and Grantor Trust by Investment Type (Details) - USD ($)
$ in Millions
May. 31, 2015
Nov. 30, 2014
May. 31, 2014
Nov. 30, 2013
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 253.5 $ 265.9 $ 120.7 $ 197.6
Grantor trust (included as a component of other current and noncurrent assets) 10.5      
Total investment 264.0      
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 60.6      
Grantor trust (included as a component of other current and noncurrent assets) 0.0      
Total investment 60.6      
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 192.9      
Grantor trust (included as a component of other current and noncurrent assets) 10.5      
Total investment $ 203.4