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Income Taxes (Effective Tax Rate Reconciliation) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
U.S. federal statutory tax rate 35.00% 21.00% 21.00% 24.50%
State taxes, net of federal benefit   0.60% 1.00% 1.00%
Income from equity affiliates   (2.30%) (2.00%) (2.10%)
Foreign tax differentials   0.10% 1.00% (1.00%)
Tax on foreign repatriated earnings   0.90% 0.10% (0.40%)
Domestic production activities   0.00% 0.00% (0.40%)
Share-based compensation   (0.80%) (0.60%) (1.00%)
Tax reform repatriation   0 0.019 0.195
Tax reform rate change and other   0.00% 0.00% (11.10%)
Tax restructuring benefit   0.00% 0.00% (1.80%)
Other   0.20% (1.40%) (1.20%)
Effective Tax Rate   19.70% 21.00% 26.00%