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Retirement Benefits (Narrative) (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 19.5	$ 27.4	$ 68.3
Minimum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	45.0
Maximum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	65.0
International
Defined Benefit Plan Disclosure [Line Items]
Prior service cost arising during period	$ 4.7