Equity Accounted Investees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Income
Net revenues	$ 13.5	$ 12.9	$ 318.9
Operating income	4.7	4.5	94.1
Other income, net	0.0	0.0	197.4
Income before income taxes	4.7	4.5	291.5
Less income tax expense	0.0	0.0	5.5
Exclude: non-controlling interests income	1.9	1.8	247.6
Net income attributable to controlling interests	2.8	2.7	38.4
Balance Sheets
Total assets	4.2	3.8
Total liabilities	1.9	1.7
Non-controlling interests in subsidiaries	0.3	0.2
Members’ equity	2.0	1.9
BSIG equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments	2.0	1.9
BSIG investment in equity method investees	2.0	1.9
BSIG
Statement of Income
Net income attributable to controlling interests	$ 2.8	$ 2.7	$ 16.3