Condensed Consolidating Financial Information - Schedule of Unaudited Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	Aug. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 28.4	$ (22.3)	$ 34.1
Cash flows from investing activities:
Capital expenditures	(9.4)	(18.5)
Net cash used in investing activities	(9.4)	(18.5)
Cash flows from financing activities:
Debt repayments / repurchases	(28.5)	(145.8)
Proceeds from issuance of debt	0.0	179.0
Debt issuance costs	0.0	(4.1)
Net transfers from (to) parent	0.0	0.0
Other financing activities	(2.9)	(65.2)
Net cash used in financing activities	(31.4)	(36.1)
Net (decrease) increase in cash and cash equivalents	(12.4)	(76.9)
Cash and Cash Equivalents at Beginning of Period	265.9	197.6	197.6
Cash and Cash Equivalents at End of Period	253.5	120.7
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	2.7	(4.6)
Cash flows from investing activities:
Capital expenditures	0.0	0.0
Net cash used in investing activities	0.0	0.0
Cash flows from financing activities:
Debt repayments / repurchases	0.0	0.0
Proceeds from issuance of debt		0.0
Debt issuance costs		0.0
Net transfers from (to) parent	0.0	0.0
Other financing activities	0.0	0.0
Net cash used in financing activities	0.0	0.0
Net (decrease) increase in cash and cash equivalents	2.7	(4.6)
Cash and Cash Equivalents at Beginning of Period	(5.7)	0.0	0.0
Cash and Cash Equivalents at End of Period	(3.0)	(4.6)
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(5.9)	(12.5)
Cash flows from investing activities:
Capital expenditures	0.0	(0.1)
Net cash used in investing activities	0.0	(0.1)
Cash flows from financing activities:
Debt repayments / repurchases	(28.4)	(145.8)
Proceeds from issuance of debt		179.0
Debt issuance costs		(4.1)
Net transfers from (to) parent	21.4	(19.0)
Other financing activities	(2.9)	(65.2)
Net cash used in financing activities	(9.9)	(55.1)
Net (decrease) increase in cash and cash equivalents	(15.8)	(67.7)
Cash and Cash Equivalents at Beginning of Period	271.6	192.7	192.7
Cash and Cash Equivalents at End of Period	255.8	125.0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	27.4	(4.7)
Cash flows from investing activities:
Capital expenditures	(9.3)	(18.0)
Net cash used in investing activities	(9.3)	(18.0)
Cash flows from financing activities:
Debt repayments / repurchases	(0.1)	0.0
Proceeds from issuance of debt		0.0
Debt issuance costs		0.0
Net transfers from (to) parent	(18.0)	17.8
Other financing activities	0.0	0.0
Net cash used in financing activities	(18.1)	17.8
Net (decrease) increase in cash and cash equivalents	0.0	(4.9)
Cash and Cash Equivalents at Beginning of Period	0.0	4.9	4.9
Cash and Cash Equivalents at End of Period	0.0	0.0
Non-guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	4.2	(0.5)
Cash flows from investing activities:
Capital expenditures	(0.1)	(0.4)
Net cash used in investing activities	(0.1)	(0.4)
Cash flows from financing activities:
Debt repayments / repurchases	0.0	0.0
Proceeds from issuance of debt		0.0
Debt issuance costs		0.0
Net transfers from (to) parent	(3.4)	1.2
Other financing activities	0.0	0.0
Net cash used in financing activities	(3.4)	1.2
Net (decrease) increase in cash and cash equivalents	0.7	0.3
Cash and Cash Equivalents at Beginning of Period	0.0	0.0	$ 0.0
Cash and Cash Equivalents at End of Period	$ 0.7	$ 0.3