Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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The number of derivative instruments of a particular group held by the entity.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Financing Agreements (Narrative) (Details) $ in Millions	6 Months Ended
Financing Agreements (Narrative) (Details) $ in Millions	Mar. 31, 2017 USD ($) units	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Payment of long-term debt	$ 36.6	$ 79.1
Deferred gains from the termination of previous interest rate swap agreements	$ 1.0		$ 1.0
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Number of derivative agreements \| units	9
Interest rate swap agreement, notional amount	$ 750.0
Interest rate swap, fair value	11.5
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Senior revolving credit facility, maximum borrowing amount	$ 1,462.5
Debt instrument, maturity date	Sep. 30, 2021
Maximum interest rate during period	3.00%
Payment of long-term debt	$ 36.6
Unamortized debt issuance costs	15.0		17.1
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 10.0
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Sep. 01, 2023
Aggregate value of debt	$ 425.0
Unsecured debenture interest rate	5.75%
Unamortized debt issuance costs			5.9
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 14, 2025
Aggregate value of debt	$ 300.0
Unsecured debenture interest rate	5.00%
Revolving Credit Facility [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Senior revolving credit facility, maximum borrowing amount	$ 700.0
Debt instrument, maturity date	Sep. 30, 2021
Maximum interest rate during period	3.00%
Revolving credit facilities	$ 228.0		235.8
Current borrowing capacity under the facility	464.4
Outstanding letters of credit	7.6
Unamortized debt issuance costs	$ 8.7		$ 9.6