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Insurance Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Insurance Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Commissions |  |  |  |  |  |  |  |  | $ 425.6 | $ 399.2 | $ 357.6
General Expenses |  |  |  |  |  |  |  |  | 194.1 | 209.0 | 241.1
Taxes, Licenses and Fees |  |  |  |  |  |  |  |  | 52.8 | 48.8 | 44.2
Total Costs Incurred |  |  |  |  |  |  |  |  | 672.5 | 657.0 | 642.9
Policy Acquisition Costs: |  |  |  |  |  |  |  |  |  |  |
Deferred |  |  |  |  |  |  |  |  | (351.6) | (314.9) | (270.6)
Amortized |  |  |  |  |  |  |  |  | 318.3 | 299.3 | 257.4
Net Policy Acquisition Costs Deferred |  |  |  |  |  |  |  |  | (33.3) | (15.6) | (13.2)
Amortization of Insurance in Force |  |  |  |  |  |  |  |  | 5.1 | 5.9 | 15.4
Insurance Expenses | $ 159.1 | $ 163.7 | $ 163.5 | $ 158.0 | $ 158.5 | $ 161.7 | $ 167.8 | $ 159.3 | $ 644.3 | $ 647.3 | $ 645.1

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- Definition Amount of expense related to deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49177698&loc=d3e10157-158409 Reference 3: 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(Column I)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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