Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	May 31, 2014	May 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ (22.3)	$ 18.9
Cash flows from investing activities:
Purchase of restricted cash investment	0	(470.0)
Capital expenditures	(18.5)	(21.7)
Purchase of investments	0	(0.5)
Net Cash Used in Investing Activities	(18.5)	(492.2)
Cash flows from financing activities:
Debt repayments \ repurchases	(145.8)	(1.3)
Proceeds from issuance of debt	179.0	460.0
Debt issuance costs	(4.1)	(13.1)
Net transfers (to) from parent	0
Other financing activities	(65.2)	0.2
Net Cash (Used in) Provided by Financing Activities	(36.1)	445.8
Net Decrease in Cash and Cash Equivalents	(76.9)	(27.5)
Cash and Cash Equivalents at Beginning of Period	197.6	162.1
Cash and Cash Equivalents at End of Period	120.7	134.6
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(4.6)	9.0
Cash flows from investing activities:
Purchase of restricted cash investment		0
Capital expenditures	0	0
Purchase of investments		0
Net Cash Used in Investing Activities	0	0
Cash flows from financing activities:
Debt repayments \ repurchases	0	0
Proceeds from issuance of debt	0	0
Debt issuance costs	0	0
Net transfers (to) from parent	0	0
Other financing activities	0	0
Net Cash (Used in) Provided by Financing Activities	0	0
Net Decrease in Cash and Cash Equivalents	(4.6)	9.0
Cash and Cash Equivalents at Beginning of Period	0	(10.3)
Cash and Cash Equivalents at End of Period	(4.6)	(1.3)
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	131.2	(1.8)
Cash flows from investing activities:
Purchase of restricted cash investment		(470.0)
Capital expenditures	(0.1)	0
Purchase of investments		0
Net Cash Used in Investing Activities	(0.1)	(470.0)
Cash flows from financing activities:
Debt repayments \ repurchases	(145.8)	(1.2)
Proceeds from issuance of debt	179.0	460.0
Debt issuance costs	(4.1)	(13.1)
Net transfers (to) from parent	(162.7)	(10.6)
Other financing activities	(65.2)	0.2
Net Cash (Used in) Provided by Financing Activities	(198.8)	435.3
Net Decrease in Cash and Cash Equivalents	(67.7)	(36.5)
Cash and Cash Equivalents at Beginning of Period	192.7	172.4
Cash and Cash Equivalents at End of Period	125.0	135.9
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(148.4)	11.6
Cash flows from investing activities:
Purchase of restricted cash investment		0
Capital expenditures	(18.0)	(21.6)
Purchase of investments		(0.5)
Net Cash Used in Investing Activities	(18.0)	(22.1)
Cash flows from financing activities:
Debt repayments \ repurchases	0	(0.1)
Proceeds from issuance of debt	0	0
Debt issuance costs	0	0
Net transfers (to) from parent	161.5	10.6
Other financing activities	0	0
Net Cash (Used in) Provided by Financing Activities	161.5	10.5
Net Decrease in Cash and Cash Equivalents	(4.9)	0
Cash and Cash Equivalents at Beginning of Period	4.9	0
Cash and Cash Equivalents at End of Period	0	0
Non-guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(0.5)	0.1
Cash flows from investing activities:
Purchase of restricted cash investment		0
Capital expenditures	(0.4)	(0.1)
Purchase of investments		0
Net Cash Used in Investing Activities	(0.4)	(0.1)
Cash flows from financing activities:
Debt repayments \ repurchases	0	0
Proceeds from issuance of debt	0	0
Debt issuance costs	0	0
Net transfers (to) from parent	1.2	0
Other financing activities	0	0
Net Cash (Used in) Provided by Financing Activities	1.2	0
Net Decrease in Cash and Cash Equivalents	0.3	0
Cash and Cash Equivalents at Beginning of Period	0	0
Cash and Cash Equivalents at End of Period	$ 0.3	$ 0