Revision of Previously Reported Financial Information - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Jul. 02, 2016	Jul. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Issuance of long-term debt			$ 498.7	$ 498.7	$ 750.0	$ 498.7
Net cash provided by operating activities from continuing operations	$ 46.2	$ 51.1	85.0	63.4	138.7	71.9
Net cash used in investing activities from continuing operations	(41.4)	(944.8)	(34.5)	(105.1)	(129.6)	(1,028.8)
Net cash (used in) provided by financing activities from continuing operations	(6.7)	(30.6)	646.2	717.4	605.7	816.4
Net increase (decrease) in cash, cash equivalents and restricted cash	25.0	(633.7)	697.5	675.5	30.1	41.8
Additions to property, plant & equipment through accounts payable and accrued liabilities	$ 6.8	5.8	11.5	15.6	$ 6.9	7.1
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Issuance of long-term debt			498.7	498.7
Net cash provided by operating activities from continuing operations			(2.6)	(5.5)
Net cash used in investing activities from continuing operations			4.1	7.0
Net cash (used in) provided by financing activities from continuing operations			498.7	498.7
Net increase (decrease) in cash, cash equivalents and restricted cash			503.1	503.1
Additions to property, plant & equipment through accounts payable and accrued liabilities			1.3	4.2
5.500% Senior Notes Due in 2024 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest rate on notes	5.50%				5.50%
Debt instrument maturity year					2024		2024
Immaterial Corrections [Member] | Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by operating activities from continuing operations		3.1				(1.1)
Net cash used in investing activities from continuing operations		$ (3.1)				1.1
Additions to property, plant & equipment through accounts payable and accrued liabilities						$ 1.1
ASU 2016-18 [Member] | Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by operating activities from continuing operations			(2.6)	(5.5)
Net cash used in investing activities from continuing operations			4.1	7.0
Net cash (used in) provided by financing activities from continuing operations			498.7	498.7
Net increase (decrease) in cash, cash equivalents and restricted cash			503.1	$ 503.1
ASU 2016-18 [Member] | 5.500% Senior Notes Due in 2024 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Issuance of long-term debt			$ 498.7
Interest rate on notes			5.50%	5.50%
Debt instrument maturity year			2024