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Investments - Other Investments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	$ 67.1	$ 66.4
Investment in the period	0.0	1.3
Unrealized/realized gain/(loss)	(0.2)	(0.8)
Closing value of investment	66.9	66.9
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.3	0.5
Investment in the period	0.0	0.1
Unrealized/realized gain/(loss)	0.1	(0.2)
Closing value of investment	0.4	0.4
Bene
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	3.8	2.9
Investment in the period	0.0	1.2
Unrealized/realized gain/(loss)	(0.3)	(0.6)
Closing value of investment	3.5	3.5
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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