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Significant transactions Significant transactions - (Tables)
6 Months Ended
Jun. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of asset held for sale
The following table summarizes the major categories of assets classified as held for sale related to the Empire Transaction as of June 30, 2020 and December 31, 2019:
(Millions)
June 30, 2020
December 31, 2019
Short-term investments, at fair value
$
9.3

$

Cash
0.2


Accounts receivable on unsettled investment sales
1.0


Total assets held for sale
$
10.5

$