Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, percent	(0.60%)	(20.20%)	3.40%	(4.10%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		21.00%	21.00%
Income tax expense (benefit)	$ (0.1)	$ 2.5	$ 10.1	$ 3.2
Continuing Operations | BAM
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (1.9)	$ (1.6)	$ (3.0)	$ (2.2)