Investments (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of investments

Investments are as follows (in millions): 

	Carrying Value
	September 30, 2017		December 31, 2016
Available-for-sale securities:
State Street Corporation	$	—	$	169.6
Other available-for-sale securities	11.9		10.9
	11.9		180.5
Other:
Trading securities	34.1		7.9
Seed capital investments, at fair value	11.7		61.0
Cost method, private equity and other investments	141.9		128.0
	187.7		196.9
Total investments	$	199.6	$	377.4

Schedule of reconciliation of available-for-sale securities from book cost basis to market value

Certain information related to our available-for-sale securities is as follows (in millions):

	September 30, 2017		December 31, 2016
Book cost basis	$	9.2	$	28.4
Gross unrealized gains	2.7		152.1
Market value	$	11.9	$	180.5