Condensed Consolidating Financial Statements - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 8.4	$ 9.8
Investing activities:
Cash paid for acquisitions, net of cash acquired	1.2	(21.5)
Decrease in restricted cash	0.2	0.3
Other, net	0.4	0
Capital expenditures	(7.3)	(6.2)
Net cash used in investing activities from continuing operations	(5.5)	(27.4)
Financing activities:
Proceeds from the issuance of common stock for cash, net of issuance costs	0	97.0
Cash paid for contingent acquisition consideration	(2.1)	(2.5)
Debt issuance costs	0	(1.0)
Repayment of debt	(0.5)	(0.5)
Financing from affiliated companies	0	0
Other, net	(0.3)	(0.3)
Net cash provided by (used in) financing activities from continuing operations	(2.9)	92.7
Net cash flows of continuing operations	0	75.1
Net operating cash flows of discontinued operations	0.8	1.3
Effect of exchange rate changes on cash and cash equivalents	(0.1)	(0.3)
Net increase in cash and cash equivalents	0.7	76.1
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(33.4)	(40.5)
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	(21.5)
Decrease in restricted cash	0	(0.4)
Other, net	0
Capital expenditures	(0.7)	0
Net cash used in investing activities from continuing operations	(0.7)	(21.9)
Financing activities:
Proceeds from the issuance of common stock for cash, net of issuance costs		97.0
Cash paid for contingent acquisition consideration	0	(2.5)
Debt issuance costs		(1.0)
Repayment of debt	0	0
Financing from affiliated companies	28.6	43.0
Other, net	(0.3)	0
Net cash provided by (used in) financing activities from continuing operations	28.3	136.5
Net cash flows of continuing operations	(5.8)	74.1
Net operating cash flows of discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	(5.8)	74.1
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	36.1	43.2
Investing activities:
Cash paid for acquisitions, net of cash acquired	1.2	0
Decrease in restricted cash	0.2	0.7
Other, net	0.4
Capital expenditures	(5.5)	(5.1)
Net cash used in investing activities from continuing operations	(3.7)	(4.4)
Financing activities:
Proceeds from the issuance of common stock for cash, net of issuance costs		0
Cash paid for contingent acquisition consideration	(2.1)	0
Debt issuance costs		0
Repayment of debt	0	0
Financing from affiliated companies	(30.7)	(43.0)
Other, net	0	(0.3)
Net cash provided by (used in) financing activities from continuing operations	(32.8)	(43.3)
Net cash flows of continuing operations	(0.4)	(4.5)
Net operating cash flows of discontinued operations	0.8	1.3
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	0.4	(3.2)
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	5.7	7.1
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Decrease in restricted cash	0	0
Other, net	0
Capital expenditures	(1.1)	(1.1)
Net cash used in investing activities from continuing operations	(1.1)	(1.1)
Financing activities:
Proceeds from the issuance of common stock for cash, net of issuance costs		0
Cash paid for contingent acquisition consideration	0	0
Debt issuance costs		0
Repayment of debt	(0.5)	(0.5)
Financing from affiliated companies	2.1	0
Other, net	0	0
Net cash provided by (used in) financing activities from continuing operations	1.6	(0.5)
Net cash flows of continuing operations	6.2	5.5
Net operating cash flows of discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	(0.1)	(0.3)
Net increase in cash and cash equivalents	6.1	5.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Decrease in restricted cash	0	0
Other, net	0
Capital expenditures	0	0
Net cash used in investing activities from continuing operations	0	0
Financing activities:
Proceeds from the issuance of common stock for cash, net of issuance costs		0
Cash paid for contingent acquisition consideration	0	0
Debt issuance costs		0
Repayment of debt	0	0
Financing from affiliated companies	0	0
Other, net	0	0
Net cash provided by (used in) financing activities from continuing operations	0	0
Net cash flows of continuing operations	0	0
Net operating cash flows of discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	$ 0	$ 0