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Employee Benefit Plans - Schedule of Fair Value of Plan Assets by Major Category and Level Within Fair Value Hierarchy (Details) - Pension Benefits - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | $ 437.3 | $ 408.9 | $ 384.2
Level 1 |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 171.4 | 160.3 |
Level 1 | U.S. companies |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [1] | 77.4 | 75.9 |
Level 1 | Mutual Funds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [1] | 81.5 | 72.7 |
Level 1 | Money market funds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [2] | 12.5 | 11.7 |
Level 2 |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 37.6 | 34.7 |
Level 2 | U.S. companies |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [1] | 8.1 | 6.9 |
Level 2 | International companies |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [3] | 13.5 | 13.3 |
Level 2 | Government and agency bonds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [4] | 7.7 | 7.0 |
Level 2 | Corporate bonds and notes |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [5] | 8.3 | 7.5 |
Level 3 |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 0.8 | 0.7 |
Level 3 | Other |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 0.8 | 0.7 |
Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 209.8 | 195.7 |
Fair Value, Inputs, Level 1, 2 and 3 | U.S. companies |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [1] | 85.5 | 82.8 |
Fair Value, Inputs, Level 1, 2 and 3 | International companies |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [3] | 13.5 | 13.3 |
Fair Value, Inputs, Level 1, 2 and 3 | Mutual Funds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [1] | 81.5 | 72.7 |
Fair Value, Inputs, Level 1, 2 and 3 | Government and agency bonds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [4] | 7.7 | 7.0 |
Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds and notes |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [5] | 8.3 | 7.5 |
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [2] | 12.5 | 11.7 |
Fair Value, Inputs, Level 1, 2 and 3 | Other |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value |  | 0.8 | 0.7 |
Fair Value Measured at Net Asset Value Per Share |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Total assets - at fair value | [6] | $ 227.5 | $ 213.2 |
[1] | Primarily valued using a market approach based on the quoted market prices of identical instruments that are actively traded on public exchanges.
[2] | These investments largely consist of short-term investment funds and are valued using a market approach based on the quoted market prices of identical instruments.
[3] | Valuation model looks at underlying security “best” price, exchange rate for underlying security’s currency against the U.S. dollar and ratio of underlying security to American depository receipt.
[4] | These investments consist of debt securities issued by the U.S. Treasury, U.S. government agencies and U.S. government-sponsored enterprises and have a variety of structures, coupon rates and maturities. These investments are considered to have low default risk as they are guaranteed by the U.S. government. Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
[5] | These investments consist of debt obligations issued by a variety of private and public corporations. These are investment grade securities which historically have provided a steady stream of income. Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
[6] | These investments consist of privately placed funds that are valued based on NAV. NAV of the funds is based on the fair value of each funds underlying investments. In accordance with ASC Subtopic 820-10, certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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