Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, percent	18.20%	(0.60%)	4.20%	3.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%
Income tax expense (benefit)	$ 24.1	$ (0.1)	$ (1.4)	$ 10.1
Continuing Operations | BAM
Income Tax Contingency [Line Items]
Income tax expense (benefit)		$ (1.9)		$ (3.0)