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Restructuring and related charges - Summary of restructuring and related charges by type and classification (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | $ 62.5 | $ 15.2 | $ 28.7
Restructuring and Related Cost, Cost Incurred to Date | 67.8 |  |
Restructuring and Related Cost, Expected Cost Remaining | 31.0 |  |
Global Expense Rationalization Initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | 0.0 | 5.2 | 17.1
Restructuring and Related Cost, Cost Incurred to Date | 29.5 | 47.0 |
Global Cost Reduction Initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | 24.2 | 5.3 | 0.0
Special Termination Benefits [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | 12.8 | 4.3 | 7.0
Restructuring and Related Cost, Cost Incurred to Date | 13.1 |  |
Restructuring and Related Cost, Expected Cost Remaining | 6.0 |  |
Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | 49.7 | $ 10.9 | $ 21.7
Restructuring and Related Cost, Cost Incurred to Date | 54.7 |  |
Restructuring and Related Cost, Expected Cost Remaining | $ 25.0 |  |

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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 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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