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Investments - Other Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	$ 5.0	$ 8.9	$ 12.1	$ 8.9
Initial investment			2.3
Goodwill	0.0	0.0	(1.8)	(22.1)
Distribution received			(9.3)	0.0
Unrealized/realized gain/(loss)	(1.1)	(0.2)	0.6	(0.2)
Closing value of investment	3.9	8.7	3.9	8.7
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.5	0.8	0.5	0.8
Initial investment			0.0
Goodwill			0.0
Distribution received			0.0
Unrealized/realized gain/(loss)	(0.1)	(0.2)	(0.1)	(0.2)
Closing value of investment	0.4	0.6	0.4	0.6
Chaspark
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.8	8.1	8.4	8.1
Initial investment			0.0
Goodwill			0.0
Distribution received			(9.3)
Unrealized/realized gain/(loss)	(0.8)	0.0	0.9	0.0
Closing value of investment	0.0	$ 8.1	0.0	$ 8.1
Bene
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	3.2		3.2
Initial investment			0.0
Goodwill			0.0
Distribution received			0.0
Unrealized/realized gain/(loss)	(0.2)		(0.2)
Closing value of investment	3.0		3.0
Digital Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening undistributed value of investment	0.5		0.0
Initial investment			2.3
Goodwill			(1.8)
Distribution received			0.0
Unrealized/realized gain/(loss)	0.0		0.0
Closing value of investment	$ 0.5		$ 0.5

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Equity Method Investment, Aggregate Cost [Roll Forward]

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-Name Accounting Standards Codification
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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