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Schedule 3 - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | $ 2,220.0 | $ 2,009.6 | $ 1,862.2
Other Income |  | 3.2 | 3.7 | 1.4
Net Investment Income |  | 298.3 | 302.6 | 309.1
Insurance Claims and Policyholders' Benefits |  | 1,780.8 | 1,467.5 | 1,261.7
Amortization of Deferred Policy Acquisition Costs |  | 299.3 | 257.4 | 235.4
Other Insurance Expenses |  | 348.0 | 387.8 | 393.0
Deferred Policy Acquisition Costs |  | 332.0 | 316.4 |
Insurance Reserves |  | 4,406.7 | 4,203.8 |
Unearned Premiums |  | 618.7 | 613.1 |
Property and Casualty Insurance [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | 1,614.8 | 1,415.2 | 1,249.5
Premiums Written |  | 1,620.9 | 1,406.2 | 1,189.1
Other Income |  | 0.5 | 0.6 | 0.5
Net Investment Income |  | 72.4 | 73.3 | 72.7
Insurance Claims and Policyholders' Benefits |  | 1,319.2 | 1,086.2 | 887.3
Amortization of Deferred Policy Acquisition Costs |  | 252.1 | 213.1 | 187.5
Other Insurance Expenses |  | 133.6 | 155.0 | 166.2
Deferred Policy Acquisition Costs |  | 82.1 | 80.7 |
Insurance Reserves |  | 884.1 | 800.5 |
Unearned Premiums |  | 592.0 | 586.1 |
Life and Health Insurance [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums | [1] | 605.2 | 594.4 | 612.7
Other Income | [1] | 2.8 | 2.4 | 0.9
Net Investment Income | [1] | 213.2 | 214.2 | 218.7
Insurance Claims and Policyholders' Benefits | [1] | 461.6 | 381.3 | 374.4
Amortization of Deferred Policy Acquisition Costs | [1] | 47.2 | 44.3 | 47.9
Other Insurance Expenses | [1] | 266.7 | 275.7 | 268.1
Deferred Policy Acquisition Costs | [1] | 249.9 | 235.7 |
Insurance Reserves | [1] | 3,479.8 | 3,346.2 |
Unearned Premiums | [1] | 26.7 | 27.0 |
Other Segments [Member] |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |
Premiums |  | 0.0 | 0.0 | 0.0
Other Income |  | (0.1) | 0.7 | 0.0
Net Investment Income |  | 12.7 | 15.1 | 17.7
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 |  | (52.3) | (42.9) | $ (41.3)
Deferred Policy Acquisition Costs |  | 0.0 | 0.0 |
Insurance Reserves |  | 42.8 | 57.1 |
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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