Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, percent	3.60%	(1.10%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Income tax expense (benefit)	$ 10.2	$ 0.7
Continuing Operations | BAM
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (1.1)	$ (0.6)