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Investments - Other Investments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	$ 67.1
Investment in the period	0.0
Unrealized/realized gain/(loss)	(0.1)
Closing value of investment	67.0
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.5
Investment in the period	0.0
Unrealized/realized gain/(loss)	0.0
Closing value of investment	0.5
Bene
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	3.2
Investment in the period	0.0
Unrealized/realized gain/(loss)	(0.1)
Closing value of investment	3.1
Digital Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.9
Investment in the period	0.0
Unrealized/realized gain/(loss)	0.0
Closing value of investment	0.9
Crop Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	62.5
Investment in the period	0.0
Unrealized/realized gain/(loss)	0.0
Closing value of investment	$ 62.5

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