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Identifiable Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2021
Goodwill [Line Items] |
Schedule of Goodwill [Table Text Block] | Changes in the carrying amount of goodwill were as follows:
| September 30,
| 2021 |  | 2020
| (in millions)
Balance at beginning of year | $ | 99.8 |  |  | $ | 95.7 |
Acquisition of Krausz | — |  |  | 0.3 |
Acquisition of i2O Water Ltd | 12.1 |  |  | — |
Change in foreign currency exchange rates | 3.2 |  |  | 3.8 |
Balance at end of year | $ | 115.1 |  |  | $ | 99.8 |
Schedule of Intangible Assets and Goodwill [Table Text Block] | Intangible assets are presented below.
| September 30,
| 2021 |  | 2020
| (in millions)
Capitalized internal-use software: |  |  |
Cost | $ | 34.1 |  |  | $ | 31.5 |
Accumulated amortization | (24.1) |  |  | (20.8) |
Capitalized internal-use software, net | $ | 10.0 |  |  | $ | 10.7 |
Business combination-related: |  |  |
Cost: |  |  |
Finite-lived intangible assets: |  |  |
Technology | 123.5 |  |  | 118.5 |
Customer relationships and other | 373.0 |  |  | 370.2 |
Indefinite-lived intangible assets: |  |  |
Trade names and trademarks | 273.8 |  |  | 271.6 |
| $ | 770.3 |  |  | $ | 760.4 |
Accumulated amortization: |  |  |
Technology | (85.8) |  |  | (81.0) |
Customer relationships and other | (302.0) |  |  | (281.2) |
| (387.8) |  |  | (362.2) |
Business combination-related intangible assets, net | 382.5 |  |  | 398.2 |
Intangible assets, net | $ | 392.5 |  |  | $ | 408.9 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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