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Schedule 3 - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | $ 2,350.0 | $ 2,220.0 | $ 2,009.6
Other Income |  | 4.0 | 3.2 | 3.7
Net Investment Income |  | 327.2 | 298.3 | 302.6
Insurance Claims and Policyholders' Benefits |  | 1,837.4 | 1,780.8 | 1,467.5
Amortization of Deferred Policy Acquisition Costs |  | 318.3 | 299.3 | 257.4
Other Insurance Expenses |  | 325.9 | 348.0 | 387.8
Deferred Policy Acquisition Costs |  | 365.3 | 332.0 |
Insurance Reserves |  | 4,537.8 | 4,406.7 |
Unearned Premiums |  | 653.9 | 618.7 |
Property and Casualty Insurance [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | 1,736.0 | 1,614.8 | 1,415.2
Premiums Written |  | 1,769.6 | 1,620.9 | 1,406.2
Other Income |  | 1.1 | 0.5 | 0.6
Net Investment Income |  | 94.3 | 72.4 | 73.3
Insurance Claims and Policyholders' Benefits |  | 1,450.0 | 1,319.2 | 1,086.2
Amortization of Deferred Policy Acquisition Costs |  | 264.8 | 252.1 | 213.1
Other Insurance Expenses |  | 118.0 | 133.6 | 155.0
Deferred Policy Acquisition Costs |  | 96.2 | 82.1 |
Insurance Reserves |  | 976.3 | 884.1 |
Unearned Premiums |  | 625.6 | 592.0 |
Life and Health Insurance [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums | [1] | 614.0 | 605.2 | 594.4
Other Income | [1] | 2.6 | 2.8 | 2.4
Net Investment Income | [1] | 221.5 | 213.2 | 214.2
Insurance Claims and Policyholders' Benefits | [1] | 387.4 | 461.6 | 381.3
Amortization of Deferred Policy Acquisition Costs | [1] | 53.5 | 47.2 | 44.3
Other Insurance Expenses | [1] | 258.7 | 266.7 | 275.7
Deferred Policy Acquisition Costs | [1] | 269.1 | 249.9 |
Insurance Reserves | [1] | 3,525.1 | 3,479.8 |
Unearned Premiums | [1] | 28.3 | 26.7 |
Other Segments [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | 0.0 | 0.0 | 0.0
Other Income |  | 0.3 | (0.1) | 0.7
Net Investment Income |  | 11.4 | 12.7 | 15.1
Insurance Claims and Policyholders' Benefits |  | 0.0 | 0.0 | 0.0
Amortization of Deferred Policy Acquisition Costs |  | 0.0 | 0.0 | 0.0
Other Insurance Expenses |  | (50.8) | (52.3) | $ (42.9)
Deferred Policy Acquisition Costs |  | 0.0 | 0.0 |
Insurance Reserves |  | 36.4 | 42.8 |
Unearned Premiums |  | $ 0.0 | $ 0.0 |
[1] | The Company’s Life & Health Insurance employee-agents also market certain property and casualty insurance products under common management. Accordingly, the Company includes the results of these property and casualty insurance products in its Life & Health Insurance segment.

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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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