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SCHEDULE III - Supplementary Insurance Information Supplementary Insurance Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Deferred policy acquisition costs | [1] | $ 780.5 | $ 651.2 | $ 564.1
Future policy benefits, losses, claims, and loss expenses | [1] | 13,086.9 | 11,368.0 | 10,039.0
Unearned premiums | [1] | 8,903.5 | 7,468.3 | 6,621.8
Other policy claims and benefits payable | [1] | 0.0 | 0.0 | 0.0
Premium revenue |  | 25,729.9 | 22,474.0 | 19,899.1
Net investment income | [1],[2] | 539.2 | 456.5 | 431.8
Benefits, claims, losses, and settlement expenses |  | 18,808.0 | 16,879.6 | 14,342.0
Amortization of deferred policy acquisition costs |  | 2,124.9 | 1,863.8 | 1,651.8
Other operating expenses |  | 3,480.7 | 2,972.0 | 2,712.1
Net Premiums Written |  | 27,132.1 | 23,353.5 | 20,564.0
Personal Lines |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premium revenue |  | 21,947.2 | 19,188.2 | 17,294.5
Benefits, claims, losses, and settlement expenses |  | 16,141.4 | 14,591.1 | 12,748.7
Amortization of deferred policy acquisition costs |  | 1,656.4 | 1,446.6 | 1,331.3
Other operating expenses |  | 2,954.8 | 2,549.2 | 2,379.9
Net Premiums Written |  | 22,928.4 | 19,819.5 | 17,703.6
Commercial Lines |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premium revenue |  | 2,793.9 | 2,421.3 | 1,995.9
Benefits, claims, losses, and settlement expenses |  | 1,966.4 | 1,741.0 | 1,244.5
Amortization of deferred policy acquisition costs |  | 309.3 | 266.7 | 219.4
Other operating expenses |  | 335.3 | 285.4 | 232.6
Net Premiums Written |  | 3,112.7 | 2,598.3 | 2,171.2
Property, Liability and Casualty Insurance Product Line |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premium revenue |  | 988.8 | 864.5 | 609.1
Benefits, claims, losses, and settlement expenses |  | 700.2 | 546.1 | 349.0
Amortization of deferred policy acquisition costs |  | 159.2 | 150.5 | 101.1
Other operating expenses |  | 190.4 | 137.2 | 98.8
Net Premiums Written |  | 1,091.0 | 935.7 | 689.6
Other Indemnity |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premium revenue |  | 0.0 | 0.0 | (0.4)
Benefits, claims, losses, and settlement expenses |  | 0.0 | 1.4 | (0.2)
Amortization of deferred policy acquisition costs |  | 0.0 | 0.0 | 0.0
Other operating expenses |  | 0.2 | 0.2 | 0.8
Net Premiums Written |  | $ 0.0 | $ 0.0 | $ (0.4)
[1] | Progressive does not allocate assets, liabilities, or investment income to operating segments.
[2] | Excludes total net realized gains (losses) on securities.

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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