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Income Taxes - Summary of Total Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax (benefit)/expense allocated to net income | $ 3.2 | $ (15.5) | $ (1.5) | $ 3.6 | $ (10.2) | $ (9.2) | $ 1.2 | $ 2.8 | $ (2.6) | $ 4.9 | $ 1.3 | $ 2.5 | $ (10.2) | $ (15.4) | $ 6.1
Income tax expense/(benefit) allocated to other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  | 4.1 | (17.4) | (1.7)
Income tax (benefit) allocated directly to shareholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (1.0)
Total income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  |  |  | $ (6.1) | $ (32.8) | $ 3.4

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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