Balance Sheet Accounts - Schedule of Estimated Fair Value and Principal Amount of Outstanding Debt (Details) - USD ($) $ in Millions	May. 31, 2015	Nov. 30, 2014
Debt Instrument [Line Items]
Fair Value	$ 879.0	$ 920.4
Principal Amount	717.9	782.2
Term Loan [Member]
Debt Instrument [Line Items]
Fair Value	96.3	98.8
Principal Amount	96.3	98.8
7.125% Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Fair Value	494.5	483.6
Principal Amount	460.0	460.0
4 1/16% Convertible Subordinated Debentures [Member]
Debt Instrument [Line Items]
Fair Value	224.5	248.2
Principal Amount	97.8	133.6
Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Fair Value	63.0	89.0
Principal Amount	63.0	89.0
Other Debt [Member]
Debt Instrument [Line Items]
Fair Value	0.7	0.8
Principal Amount	$ 0.8	$ 0.8