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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Derivatives, Fair Value [Line Items] |  |  |  |
Document Period End Date | Mar. 31, 2018 |  |  |
Derivatives designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | $ 3.7 |  | $ 1.2 |
Total liability derivatives |  |  | 0.4 | $ 3.3
Derivatives designated as hedging instruments | Interest Rate Swap [Member] | Receivables, net |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives |  | $ 1.4 | 0.0 |
Derivatives designated as hedging instruments | Interest Rate Swap [Member] | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | 1.9 |  | 0.4 |
Derivatives designated as hedging instruments | Interest Rate Contract [Member] | Accounts payable and other current liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives | 0.0 |  | 0.5 |
Derivatives designated as hedging instruments | Interest Rate Contract [Member] | Accrued Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives | 0.0 |  | 0.2 |
Derivatives designated as hedging instruments | Commodity swap and option agreements | Receivables, net |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | 0.3 |  | 0.6 |
Derivatives designated as hedging instruments | Foreign exchange contracts | Receivables, net |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | 0.1 |  | 0.2 |
Derivatives designated as hedging instruments | Foreign exchange contracts | Accounts payable and other current liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives | 0.3 |  | 2.3 |
Derivatives designated as hedging instruments | Foreign exchange contracts | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives | 0.0 |  | 0.3 |
Derivatives designated as hedging instruments | Commodity contracts | Accounts payable and other current liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives |  |  | 0.1 | 0.0
Derivatives not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | 3.7 |  | 1.5 |
Total liability derivatives | 1.1 |  | 3.3 |
Derivatives not designated as hedging instrument | Foreign exchange forward agreements | Accounts payable and other current liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total liability derivatives |  |  | 0.7 | $ 0.0
Derivatives not designated as hedging instrument | Foreign exchange contracts | Receivables, net |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total asset derivatives | $ 0.0 |  | $ 0.3 |

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