Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefits - Narrative (Details)

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Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost $ 2.8 $ 2.7
$900 revolving credit facility (excluding outstanding letters of credit)    
Defined Benefit Plan Disclosure [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 757.0