Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Dec. 31, 2016	Nov. 30, 2015	Nov. 30, 2014
Operating Loss Carryforwards [Line Items]
Effective income tax rate - provision (benefit)	22.20%										38.20%	(1.80%)	(49.40%)
Income (loss) from continuing operations before income taxes	$ 9.0	$ (9.6)	$ 34.3	$ (25.2)	$ 11.5	$ 8.7	$ 15.5	$ (60.2)	$ 37.2	$ (9.3)	$ 29.3	$ (16.8)	$ (33.0)
Federal statutory tax rate	35.00%										35.00%	35.00%	35.00%
Unrecognized tax benefits, effect in tax rate			5.3								$ 5.3
Accrued interest and penalties related to uncertain tax positions			2.4								2.4
Possible reduction in unrecognized tax benefits and related interest (less than)			29.3								29.3
Loss carryover in foreign jurisdictions			8.3								8.3
Research and development credit carryover	$ 3.8		6.5								6.5
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, set to expire			18.4								18.4
Net operating loss carryforwards			1.2								1.2
State | California
Operating Loss Carryforwards [Line Items]
Research and development credit carryover			2.5								2.5
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Research and development credit carryover			$ 2.8								$ 2.8