Revision of Previously Reported Financial Information - Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 29, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 29, 2018	Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities and other liabilities	$ 28.4	$ 7.7	$ 24.0	$ (6.2)	$ 22.2	$ 58.5
Net cash provided by operating activities from continuing operations	78.2	32.9	46.2	67.9	146.1	138.7
Operating activities of discontinued operations	$ (5.6)	(84.7)	$ 47.4	(88.0)	$ (93.6)	$ 56.1
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities and other liabilities		(2.6)		(16.5)
Net cash provided by operating activities from continuing operations		22.6		57.6
Operating activities of discontinued operations		(74.4)		(77.7)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities and other liabilities		10.3		10.3
Net cash provided by operating activities from continuing operations		10.3		10.3
Operating activities of discontinued operations		$ (10.3)		$ (10.3)