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Reinsurance - Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Premiums written: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,812.4 | $ 1,733.8 | $ 1,748.4
Assumed |  |  |  |  |  |  |  |  |  |  |  |  | 1,548.5 | 1,413.2 | 1,248.9
Ceded |  |  |  |  |  |  |  |  |  |  |  |  | (1,148.4) | (553.3) | (351.1)
Net premiums written |  |  |  |  |  |  |  |  |  |  |  |  | 2,212.5 | 2,593.7 | 2,646.2
Premiums earned: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  |  |  |  |  | 1,757.4 | 1,768.4 | 1,703.3
Assumed |  |  |  |  |  |  |  |  |  |  |  |  | 1,451.8 | 1,317.9 | 1,153.5
Ceded |  |  |  |  |  |  |  |  |  |  |  |  | (902.6) | (449.0) | (383.5)
Net premiums earned | $ 511.0 | $ 652.5 | $ 562.0 | $ 581.1 | $ 612.4 | $ 681.0 | $ 680.8 | $ 663.1 | $ 629.7 | $ 640.6 | $ 609.4 | $ 593.6 | 2,306.6 | 2,637.3 | 2,473.3
Insurance losses and loss adjustment expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  |  |  |  |  | 1,673.6 | 1,091.9 | 980.6
Assumed |  |  |  |  |  |  |  |  |  |  |  |  | 1,399.9 | 699.6 | 493.0
Ceded |  |  |  |  |  |  |  |  |  |  |  |  | (1,078.8) | (215.4) | (107.4)
Net insurance losses and loss adjustment expenses | $ 544.2 | $ 776.2 | $ 346.1 | $ 328.2 | $ 387.3 | $ 389.2 | $ 442.2 | $ 357.4 | $ 334.0 | $ 365.6 | $ 360.5 | $ 306.1 | $ 1,994.7 | $ 1,576.1 | $ 1,366.2

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of earned premiums ceded to other entities. + 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 210.7-04.1) -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 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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