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Income Taxes - Reconciliation of Expected Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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