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Income Taxes - Reconciliation of Expected Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Comparison of income tax expense (benefit) and tax computed at the statutory rate
Income taxes at federal statutory rate									$ 560.7	$ 473.7	$ 393.2
Increase (decrease) in tax resulting from:
State income taxes, net of federal benefit									42.3	38.6	37.0
Domestic production activities deduction									(39.8)	(36.3)	(35.7)
Valuation allowance									0.8	0.2	(21.0)
Tax credits									(3.5)	(15.9)	(2.2)
Other									3.2	6.9	1.4
Total income tax expense (benefit)	$ 172.3	$ 155.5	$ 124.7	$ 111.2	$ 149.4	$ 128.8	$ 105.4	$ 83.6	$ 563.7	$ 467.2	$ 372.7

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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