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Restructuring and related charges - Summary of restructuring and related charges by type and classification (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ 23.2 | $ 8.0 | $ 43.6 | $ 10.2
Restructuring and Related Cost, Cost Incurred to Date | 109.1 |  | 109.1 |
Restructuring and Related Cost, Expected Cost Remaining | 19.2 |  | 19.2 |
Global Expense Rationalization Initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date | 36.7 |  | 36.7 |
Global Cost Reduction Initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | 3.1 | 5.5 | 28.8 | 1.2
Special Termination Benefits [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | 4.0 | 1.3 | 5.1 | 2.1
Restructuring and Related Cost, Cost Incurred to Date | 16.1 |  | 16.1 |
Restructuring and Related Cost, Expected Cost Remaining | 0.4 |  | 0.4 |
Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | 19.2 | $ 6.7 | 38.5 | $ 8.1
Restructuring and Related Cost, Cost Incurred to Date | 93.0 |  | 93.0 |
Restructuring and Related Cost, Expected Cost Remaining | $ 18.8 |  | $ 18.8 |

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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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