Retirement Benefits - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2017 |
Dec. 31, 2016 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
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| Compensation and Retirement Disclosure [Abstract] | |||||
| Pension Contributions | $ 80.0 | ||||
| Postemployment Benefits, Period Expense | $ 0.1 | $ 0.0 | $ 0.3 | $ 0.2 | |
| Defined Contribution Plan, Cost Recognized | $ 2.7 | $ 2.4 | $ 8.4 | $ 7.0 | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of contributions made by the employer to defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of the cost recognized during the period for defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Period expense related to postemployment benefits. No definition available.
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