Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, percent	(1.10%)	(8.30%)
U.S. statutory rate (as a percent)	21.00%	35.00%
Income tax expense (benefit)	$ 0.7	$ (0.3)
Continuing Operations | BAM
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (0.6)	$ (2.7)