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Employee Benefit Obligations - Schedule of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 198.9 | $ 192.7 |
Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 69.3 | 69.5 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 129.6 | 123.2 |
Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 33.2 | 34.0 |
Common Stock [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 24.1 | 22.2 |
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 9.1 | 11.8 |
Equity Securities, Foreign-listed [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12.7 | 12.7 |
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 11.3 | 10.4 |
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.4 | 2.3 |
Life insurance contracts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 40.2 | 37.0 |
Life insurance contracts [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Life insurance contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Life insurance contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 40.2 | 37.0 |
Other benefit plan assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 49.2 | 35.1 |
Other benefit plan assets [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Other benefit plan assets [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Other benefit plan assets [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 49.2 | 35.1 |
U.S. Corporate and Government Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 29.1 | 26.7 |
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 21.0 | 19.6 |
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8.1 | 7.1 |
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 9.0 | 13.7 |
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 9.0 | 13.7 |
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Real Estate Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.8 | 7.5 |
Real Estate Investments [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.8 | 1.7 |
Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 5.8 |
Foreign Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23.7 | 26.0 |
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2.1 | 1.9 |
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 21.6 | $ 24.1 |
UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 100.00% | 100.00% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 80.5 | $ 77.7 | $ 72.6
UNITED STATES | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 58.00% | 61.00% |
UNITED STATES | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 39.00% | 36.00% |
UNITED STATES | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 3.00% | 3.00% |
Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 100.00% | 100.00% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 118.4 | $ 115.0 | $ 116.9
Non-US [Member] | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 0.00% | 0.00% |
Non-US [Member] | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 19.00% | 23.00% |
Non-US [Member] | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 81.00% | 77.00% |

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