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Income Taxes (Narrative) (Details) - USD ($) $ in Millions				3 Months Ended	9 Months Ended
	Jun. 14, 2019	Jan. 01, 2018	Dec. 22, 2017	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Line Items]
U.S. Federal statutory income tax rate		21.00%	35.00%	21.00%	21.00%
Tax benefit from reduction U.S. corporate income tax rate						$ 198.7
Mandatory repatriation tax payable period					8 years
Repatriation tax liability				$ 22.9	$ 22.9
Repatriation tax liability due and payable in the next 12 months, may be reduced or offset				2.0	2.0
U.S. net operating losses				450.8	450.8
Foreign tax credits	$ 63.9
Tax benefit for reducing deferred tax liability	48.0
Valuation allowance	63.9
Federal and state tax expense				95.1	$ 95.1
Valuation allowance, net operating losses	$ 36.7
Income tax expense for one-time deemed mandatory repatriation						71.0
GILTI [Member]
Income Taxes [Line Items]
U.S. Federal statutory income tax rate					21.00%
Spectrum Merger [Member]
Income Taxes [Line Items]
Valuation allowance						$ 335.0
SB/RH [Member]
Income Taxes [Line Items]
Income taxes payable				$ 114.9	$ 114.9

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