Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities from continuing operations	$ (12.4)	$ (15.1)
Investing activities:
Investment in affiliated companies	0.0	0.0
Change in restricted cash	0.0	4.7
Capital expenditures	(3.5)	(5.2)
Proceeds from sale of assets	0.0	0.9
Net cash provided by (used in) investing activities from continuing operations	(3.5)	0.4
Financing activities:
Repayment of debt	(0.5)	(0.5)
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	1.0	1.6
Cash paid for contingent acquisition consideration	0.0	(0.7)
Financing from affiliated companies	0.0	0.0
Net cash provided by financing activities from continuing operations	0.5	0.4
Net cash flows of continuing operations	(15.4)	(14.3)
Net operating cash flows of discontinued operations	0.1	3.5
Net investing cash flows of discontinued operations	4.5	(0.5)
Effect of exchange rate changes on cash and cash equivalents	(0.1)	0.0
Net decrease in cash and cash equivalents	(10.9)	(11.3)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities from continuing operations	0.0	0.0
Investing activities:
Investment in affiliated companies	2.3	11.9
Change in restricted cash		0.0
Capital expenditures	0.0	0.0
Proceeds from sale of assets		0.0
Net cash provided by (used in) investing activities from continuing operations	2.3	11.9
Financing activities:
Repayment of debt	0.0	0.0
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	0.0	0.0
Cash paid for contingent acquisition consideration		0.0
Financing from affiliated companies	(2.3)	(11.9)
Net cash provided by financing activities from continuing operations	(2.3)	(11.9)
Net cash flows of continuing operations	0.0	0.0
Net operating cash flows of discontinued operations	0.0	0.0
Net investing cash flows of discontinued operations	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0
Net decrease in cash and cash equivalents	0.0	0.0
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities from continuing operations	(13.2)	(26.5)
Investing activities:
Investment in affiliated companies	(2.3)	0.0
Change in restricted cash		0.0
Capital expenditures	(0.5)	(0.3)
Proceeds from sale of assets		0.0
Net cash provided by (used in) investing activities from continuing operations	(2.8)	(0.3)
Financing activities:
Repayment of debt	0.0	0.0
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	1.0	1.6
Cash paid for contingent acquisition consideration		0.0
Financing from affiliated companies	0.0	11.9
Net cash provided by financing activities from continuing operations	1.0	13.5
Net cash flows of continuing operations	(15.0)	(13.3)
Net operating cash flows of discontinued operations	0.2	0.0
Net investing cash flows of discontinued operations	4.5	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0
Net decrease in cash and cash equivalents	(10.3)	(13.3)
Subsidiary Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities from continuing operations	1.5	13.7
Investing activities:
Investment in affiliated companies	0.0	(11.9)
Change in restricted cash		4.7
Capital expenditures	(2.0)	(4.5)
Proceeds from sale of assets		0.9
Net cash provided by (used in) investing activities from continuing operations	(2.0)	(10.8)
Financing activities:
Repayment of debt	0.0	0.0
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	0.0	0.0
Cash paid for contingent acquisition consideration		(0.7)
Financing from affiliated companies	2.3	0.0
Net cash provided by financing activities from continuing operations	2.3	(0.7)
Net cash flows of continuing operations	1.8	2.2
Net operating cash flows of discontinued operations	(0.1)	1.7
Net investing cash flows of discontinued operations	0.0	(0.3)
Effect of exchange rate changes on cash and cash equivalents	0.0
Net decrease in cash and cash equivalents	1.7	3.6
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities from continuing operations	(0.7)	(2.3)
Investing activities:
Investment in affiliated companies	0.0	0.0
Change in restricted cash		0.0
Capital expenditures	(1.0)	(0.4)
Proceeds from sale of assets		0.0
Net cash provided by (used in) investing activities from continuing operations	(1.0)	(0.4)
Financing activities:
Repayment of debt	(0.5)	(0.5)
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	0.0	0.0
Cash paid for contingent acquisition consideration		0.0
Financing from affiliated companies	0.0	0.0
Net cash provided by financing activities from continuing operations	(0.5)	(0.5)
Net cash flows of continuing operations	(2.2)	(3.2)
Net operating cash flows of discontinued operations	0.0	1.8
Net investing cash flows of discontinued operations	0.0	(0.2)
Effect of exchange rate changes on cash and cash equivalents	(0.1)
Net decrease in cash and cash equivalents	$ (2.3)	$ (1.6)