Investments - OTTI (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($) securities	Jun. 30, 2016 USD ($) securities	Jun. 30, 2017 USD ($) securities	Jun. 30, 2016 USD ($) securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.3	$ 1.1	$ 0.4	$ 8.4
No. of Securities \| securities	9	15	13	23
Write-downs related to credit impairments	$ 0.0	$ 0.6	$ 0.1	$ 1.0
Impairment, Intent impairments	$ 0.3	$ 0.5	$ 0.3	$ 7.4
No. of Securities, Intent Impairments \| securities	3	1	4	3
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.1	$ 0.0	$ 0.1	$ 0.1
No. of Securities \| securities	1	0	1	1
Impairment, Intent impairments	$ 0.1	$ 0.0	$ 0.1	$ 0.0
No. of Securities, Intent Impairments \| securities	1	0	1	0
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.0	$ 0.4	$ 0.0	$ 7.3
No. of Securities \| securities	0	1	0	2
Impairment, Intent impairments	$ 0.0	$ 0.0	$ 0.0	$ 6.9
No. of Securities, Intent Impairments \| securities	0	0	0	1
Foreign corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.0	$ 0.1	$ 0.0	$ 0.1
No. of Securities \| securities	0	1	0	1
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.2	$ 0.6	$ 0.3	$ 0.9
No. of Securities \| securities	7	13	11	19
Impairment, Intent impairments	$ 0.2	$ 0.5	$ 0.2	$ 0.5
No. of Securities, Intent Impairments \| securities	1	1	2	2
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment	$ 0.0	$ 0.0	$ 0.0	$ 0.0
No. of Securities \| securities	1	0	1	0
Impairment, Intent impairments	$ 0.0	$ 0.0	$ 0.0	$ 0.0
No. of Securities, Intent Impairments \| securities	1	0	1	0

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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