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Income Taxes - Summary of Total Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense/(benefit) allocated to net loss	$ 22.9	$ (10.2)	$ (15.4)
Income tax expense/(benefit) allocated to other comprehensive income	11.2	4.1	(17.4)
Total income tax expense/(benefit)	$ 34.1	$ (6.1)	$ (32.8)

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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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