Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefits - Narrative (Details)

v3.20.2
Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Nov. 21, 2019
Defined Benefit Plan Disclosure [Line Items]          
Accrued pension and postretirement healthcare         $ 30.7
Defined Contribution Plan, Cost $ 3.7 $ 3.0 $ 10.8 $ 8.7