Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefits - Narrative (Details)

v3.19.2
Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Defined Contribution Plan, Cost $ 3.0 $ 3.0 $ 8.7 $ 8.6