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Investments - Other Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	$ 66.1	$ 66.4
Investment in the period	1.2	1.2
Unrealized/realized gain/(loss)	(0.2)	(0.5)
Closing value of investment	67.1	67.1
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.4	0.5
Investment in the period	0.0	0.0
Unrealized/realized gain/(loss)	(0.1)	(0.2)
Closing value of investment	0.3	0.3
Bene
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	2.7	2.9
Investment in the period	1.2	1.2
Unrealized/realized gain/(loss)	(0.1)	(0.3)
Closing value of investment	3.8	3.8
Digital Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.5	0.5
Investment in the period	0.0	0.0
Unrealized/realized gain/(loss)	0.0	0.0
Closing value of investment	0.5	0.5
Crop Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	62.5	62.5
Investment in the period	0.0	0.0
Unrealized/realized gain/(loss)	0.0	0.0
Closing value of investment	$ 62.5	$ 62.5

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Equity Method Investment, Aggregate Cost [Roll Forward]

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-Publisher FASB
-Name Accounting Standards Codification
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