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Restructuring and related charges - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Cost Incurred to Date | $ 65.7 |  |
Restructuring charges | 60.4 | $ 14.0 | $ 19.5
Consumer products cost of goods sold classification |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 18.1 | 0.2 | 1.4
Selling, acquisition, operating and general expenses classification |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 42.3 | 13.8 | 18.1
Pet Rightsizing Initiative [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Cost Incurred to Date | 8.2 |  |
Restructuring and Related Cost, Expected Cost | 11.0 |  |
Restructuring charges | 8.2 | 0.0 | 0.0
HHI Business Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 16.6 |
Restructuring charges | 0.0 | $ 2.2 | 9.5
Expected Completion Date |  | Sep. 30, 2016 |
HHI Distribution Center Consolidation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Cost Incurred to Date | 27.4 |  |
Restructuring and Related Cost, Expected Cost | 50.0 |  |
Restructuring charges | 27.4 | $ 0.0 | 0.0
Global Expense Rationalization Initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Cost Incurred to Date | 29.5 | 47.0 |
Restructuring and Related Cost, Expected Cost | 32.0 |  |
Restructuring charges | $ 0.3 | $ 4.6 | $ 9.0
Expected Completion Date |  | Sep. 30, 2016 |

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- Definition Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(a)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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