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Income Taxes - Summary of Total Income Tax (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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax (benefit)/expense allocated to net income	$ (10.2)	$ (9.2)	$ 1.2	$ 2.8	$ (2.6)	$ 4.9	$ 1.3	$ 2.5	$ 5.3	$ 1.8	$ 2.2	$ 5.1	$ (15.4)	$ 6.1	$ 14.4
Income tax (benefit) allocated to other comprehensive income													(17.4)	(1.7)	(15.3)
Income tax (benefit) allocated directly to shareholders’ equity													0.0	(1.0)	(1.9)
Total income tax (benefit)/expense													$ (32.8)	$ 3.4	$ (2.8)

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The sum of the tax effects of all items occurring during the period that have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324

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-Publisher FASB
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) for continuing operations, discontinued operations, other comprehensive income, and items charged (credited) directly to shareholders' equity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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