Condensed Consolidating Financial Statements - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 7.7	$ 22.6	$ 52.3
Investing activities:
Cash paid for acquisitions, net of cash acquired	(2.6)	2.2	(149.4)
Decrease (Increase) in restricted cash	(0.4)	0.4	0.6
Proceeds from the disposition of discontinued operations	0	1.3	0.3
Investment in affiliated companies	0	0	0
Capital expenditures	(14.2)	(16.6)	(16.6)
Net cash used in investing activities from continuing operations	(17.2)	(12.7)	(165.1)
Financing activities:
Proceeds from the issuance of common stock	0	0	97.0
Cash paid for contingent acquisition consideration	0	(2.1)	(2.5)
Proceeds from the issuance of long-term debt	618.5	0	0
Extinguishment of long-term debt	(661.5)	0	0
Debt issuance costs paid	(10.0)	0	(1.2)
Credit agreement borrowings	41.0
Repayment of debt	(1.0)	(1.0)	(1.5)
Purchase of ESPP shares		1.1
Financing from affiliated companies	0	0	0
Other, net	3.3	0	(3.4)
Net cash provided by (used in) financing activities from continuing operations	(9.7)	(2.0)	90.9
Net cash flows of continuing operations	(19.2)	7.9	(21.9)
Net operating cash flows of discontinued operations	(1.6)	(1.3)	1.3
Effect of exchange rate changes on cash and cash equivalents	(0.2)	0.1	0
Net increase (decrease) in cash and cash equivalents	(21.0)	6.7	(20.6)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(72.2)	(65.9)	(98.2)
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0	2.3
Decrease (Increase) in restricted cash	0	0	0
Proceeds from the disposition of discontinued operations	0	0	0
Investment in affiliated companies	0	0	(10.8)
Capital expenditures	(0.8)	(1.4)	(0.5)
Net cash used in investing activities from continuing operations	(0.8)	(1.4)	(9.0)
Financing activities:
Proceeds from the issuance of common stock			97.0
Cash paid for contingent acquisition consideration		0
Proceeds from the issuance of long-term debt	618.5
Extinguishment of long-term debt	(661.5)
Debt issuance costs paid	(10.0)		(1.2)
Credit agreement borrowings	41.0
Repayment of debt	0	0	0
Purchase of ESPP shares		1.1
Financing from affiliated companies	67.7	71.1	0
Other, net	3.3	0	(3.4)
Net cash provided by (used in) financing activities from continuing operations	59.0	72.2	92.4
Net cash flows of continuing operations	(14.0)	4.9	(14.8)
Net operating cash flows of discontinued operations	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(14.0)	4.9	(14.8)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	81.4	87.5	144.5
Investing activities:
Cash paid for acquisitions, net of cash acquired	(2.6)	2.2	(151.7)
Decrease (Increase) in restricted cash	(0.4)	0.4	0.6
Proceeds from the disposition of discontinued operations	0	1.3	0.3
Investment in affiliated companies	(67.9)	(74.8)	0
Capital expenditures	(11.9)	(12.3)	(14.2)
Net cash used in investing activities from continuing operations	(82.8)	(83.2)	(165.0)
Financing activities:
Proceeds from the issuance of common stock			0
Cash paid for contingent acquisition consideration		(2.1)
Proceeds from the issuance of long-term debt	0
Extinguishment of long-term debt	0
Debt issuance costs paid	0		0
Credit agreement borrowings	0
Repayment of debt	0	0	(0.5)
Purchase of ESPP shares		0
Financing from affiliated companies	0	0	12.8
Other, net	0	0	0
Net cash provided by (used in) financing activities from continuing operations	0	(2.1)	12.3
Net cash flows of continuing operations	(1.4)	2.2	(8.2)
Net operating cash flows of discontinued operations	(1.6)	(1.3)	1.3
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(3.0)	0.9	(6.9)
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1.5)	1.0	6.0
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0	0
Decrease (Increase) in restricted cash	0	0	0
Proceeds from the disposition of discontinued operations	0	0	0
Investment in affiliated companies	0	0	(2.0)
Capital expenditures	(1.5)	(2.9)	(1.9)
Net cash used in investing activities from continuing operations	(1.5)	(2.9)	(3.9)
Financing activities:
Proceeds from the issuance of common stock			0
Cash paid for contingent acquisition consideration		0
Proceeds from the issuance of long-term debt	0
Extinguishment of long-term debt	0
Debt issuance costs paid	0		0
Credit agreement borrowings	0
Repayment of debt	(1.0)	(1.0)	(1.0)
Purchase of ESPP shares		0
Financing from affiliated companies	0.2	3.7	0
Other, net	0	0	0
Net cash provided by (used in) financing activities from continuing operations	(0.8)	2.7	(1.0)
Net cash flows of continuing operations	(3.8)	0.8	1.1
Net operating cash flows of discontinued operations	0	0	0
Effect of exchange rate changes on cash and cash equivalents	(0.2)	0.1	0
Net increase (decrease) in cash and cash equivalents	(4.0)	0.9	1.1
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0	0
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0	0
Decrease (Increase) in restricted cash	0	0	0
Proceeds from the disposition of discontinued operations	0	0	0
Investment in affiliated companies	67.9	74.8	12.8
Capital expenditures	0	0	0
Net cash used in investing activities from continuing operations	67.9	74.8	12.8
Financing activities:
Proceeds from the issuance of common stock			0
Cash paid for contingent acquisition consideration		0
Proceeds from the issuance of long-term debt	0
Extinguishment of long-term debt	0
Debt issuance costs paid	0		0
Credit agreement borrowings	0
Repayment of debt	0	0	0
Purchase of ESPP shares		0
Financing from affiliated companies	(67.9)	(74.8)	(12.8)
Other, net	0	0	0
Net cash provided by (used in) financing activities from continuing operations	(67.9)	(74.8)	(12.8)
Net cash flows of continuing operations	0	0	0
Net operating cash flows of discontinued operations	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	$ 0	$ 0	$ 0