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Intangible Assets and Goodwill - Summary of Changes in Intangible Assets (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 19, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Amortization |  | $ (1.3) | $ (0.8) | $ (3.3) | $ (3.8)
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning of the period |  | 26.0 | 22.1 | 24.2 | 0.0
Goodwill, Additions |  | 0.0 | 0.0 | 1.8 | 22.1
Goodwill, End of the period |  | 26.0 | 22.1 | 26.0 | 22.1
Intangible assets and goodwill, Beginning of the period |  | 79.4 | 72.0 | 79.6 | 18.2
Intangible Assets and Goodwill, Acquired |  | 0.0 | 1.9 | 1.8 | 58.7
Intangible assets and goodwill, End of the period |  | 78.1 | 73.1 | 78.1 | 73.1
Trade Mark |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 6.3 | 5.4 | 6.6 | 1.6
Intangible Assets, Additions |  | 0.0 | 0.0 | 0.0 | 4.0
Amortization |  | (0.3) | (0.1) | (0.6) | (0.3)
Intangible Assets, End of the period | $ 4.0 | 6.0 | 5.3 | 6.0 | 5.3
Insurance Licenses |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 16.7 | 16.6 | 16.7 | 16.6
Intangible Assets, Additions |  | 0.0 | 0.0 | 0.0 | 0.0
Amortization |  | 0.0 | 0.0 | 0.0 | 0.0
Intangible Assets, End of the period |  | 16.7 | 16.6 | 16.7 | 16.6
Agency Relationships |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 25.1 | 24.2 | 26.2 | 0.0
Intangible Assets, Additions |  | 0.0 | 0.0 | 0.0 | 25.0
Amortization |  | (0.5) | (0.4) | (1.6) | (1.2)
Intangible Assets, End of the period | 25.0 | 24.6 | 23.8 | 24.6 | 23.8
Non-compete Agreements |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 3.0 | 2.6 | 3.3 | 0.0
Intangible Assets, Additions | 2.9 | 0.0 | 0.0 | 0.0 | 2.9
Amortization |  | (0.3) | (0.1) | (0.6) | (0.4)
Intangible Assets, End of the period |  | 2.7 | 2.5 | 2.7 | 2.5
Value of Business Acquired |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 0.0 | 0.2 | 0.0 | 0.0
Intangible Assets, Additions |  | 0.0 | 0.0 | 0.0 | 1.8
Amortization |  | 0.0 | (0.2) | 0.0 | (1.8)
Intangible Assets, End of the period |  | 0.0 | 0.0 | 0.0 | 0.0
Consulting Relationships |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 0.8 | 0.9 | 0.9 | 0.0
Intangible Assets, Additions |  | 0.0 | 0.0 | 0.0 | 1.0
Amortization |  | (0.1) | 0.0 | (0.2) | (0.1)
Intangible Assets, End of the period | $ 1.0 | 0.7 | 0.9 | 0.7 | 0.9
Contractual Rights |  |  |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible Assets, Beginning of the period |  | 1.5 | 0.0 | 1.7 | 0.0
Intangible Assets, Additions |  | 0.0 | 1.9 | 0.0 | 1.9
Amortization |  | (0.1) | 0.0 | (0.3) | 0.0
Intangible Assets, End of the period |  | $ 1.4 | $ 1.9 | $ 1.4 | $ 1.9

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- Definition Finite and Indefinite Lived Intangible Assets [Roll Forward] + References No definition available. + Details
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- Definition Indefinite-lived and Finite-lived Intangible Assets Acquired + References No definition available. + Details
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- Definition Intangible Assets and Goodwill, Acquired + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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