Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Income Tax Contingency [Line Items]
U.S. statutory rate (as a percent)			35.00%	35.00%
Income tax expense (benefit)	$ (4.0)	$ (17.1)	$ (5.3)	$ (22.7)
Effective income tax rate reconciliation, percent	(47.60%)	(123.90%)	(203.90%)	(31.20%)
Tax Year 2012
Income Tax Contingency [Line Items]
Deferred tax assets, gross					$ 0.6
Operating loss carryforwards, valuation allowance					$ 0.6
Continuing Operations
Income Tax Contingency [Line Items]
Income tax expense (benefit)				$ (14.0)
Continuing Operations | BAM
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (2.1)	$ (3.3)	$ (6.9)	$ (8.2)