Condensed Consolidating Financial Statements - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 52.3	$ 5.2	$ 28.3
Investing activities:
Cash paid for acquisitions, net of cash acquired	(149.4)	(391.1)	(206.9)
Decrease in restricted cash	0.6	3.0	(0.1)
Capital expenditures	(16.6)	(7.5)	(2.3)
Payments for (Proceeds from) Other Investing Activities	0.3
Net cash used in investing activities from continuing operations	(165.1)	(395.6)	(209.2)
Financing activities:
Proceeds from the issuance of common stock	97.0	61.1	24.7
Proceeds from the issuance of long-term debt	0	425.7	225.0
Debt issuance costs paid	(1.2)	(22.1)	(11.0)
Purchase of treasury stock	0	(10.9)	0
Repayment of debt	(1.5)	(3.4)
Financing from affiliated companies	0	0
Other, net	(3.4)	2.0
Net cash provided by financing activities from continuing operations	90.9	452.4	181.9
Net cash flows of continuing operations	(21.9)	62.0	1.0
Net operating cash flows of discontinued operations	1.3	(2.7)	(0.1)
Effect of exchange rate changes on cash and cash equivalents	0	(0.5)	0
Net increase (decrease) in cash and cash equivalents	(20.6)	58.8	0.9
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(98.2)	(55.1)
Investing activities:
Cash paid for acquisitions, net of cash acquired	2.3	(421.0)
Decrease in restricted cash	0	1.4
Capital expenditures	(0.5)	(0.2)
Payments for (Proceeds from) Other Investing Activities	0
Net cash used in investing activities from continuing operations	1.8	(419.8)
Financing activities:
Proceeds from the issuance of common stock	97.0	61.1
Proceeds from the issuance of long-term debt		425.7
Debt issuance costs paid	(1.2)	(22.1)
Purchase of treasury stock		(10.9)
Repayment of debt	0	0
Financing from affiliated companies	(10.8)	63.6
Other, net	(3.4)	2.0
Net cash provided by financing activities from continuing operations	81.6	519.4
Net cash flows of continuing operations	(14.8)	44.5
Net operating cash flows of discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(14.8)	44.5
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	144.5	60.5
Investing activities:
Cash paid for acquisitions, net of cash acquired	(151.7)	18.0
Decrease in restricted cash	0.6	1.6
Capital expenditures	(14.2)	(6.3)
Payments for (Proceeds from) Other Investing Activities	0.3
Net cash used in investing activities from continuing operations	(165.0)	13.3
Financing activities:
Proceeds from the issuance of common stock	0	0
Proceeds from the issuance of long-term debt		0
Debt issuance costs paid	0	0
Purchase of treasury stock		0
Repayment of debt	(0.5)	(2.6)
Financing from affiliated companies	12.8	(68.6)
Other, net	0	0
Net cash provided by financing activities from continuing operations	12.3	(71.2)
Net cash flows of continuing operations	(8.2)	2.6
Net operating cash flows of discontinued operations	1.3	(2.2)
Effect of exchange rate changes on cash and cash equivalents	0	(0.3)
Net increase (decrease) in cash and cash equivalents	(6.9)	0.1
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	6.0	(0.2)
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	11.9
Decrease in restricted cash	0	0
Capital expenditures	(1.9)	(1.0)
Payments for (Proceeds from) Other Investing Activities	0
Net cash used in investing activities from continuing operations	(1.9)	10.9
Financing activities:
Proceeds from the issuance of common stock	0	0
Proceeds from the issuance of long-term debt		0
Debt issuance costs paid	0	0
Purchase of treasury stock		0
Repayment of debt	(1.0)	(0.8)
Financing from affiliated companies	(2.0)	5.0
Other, net	0	0
Net cash provided by financing activities from continuing operations	(3.0)	4.2
Net cash flows of continuing operations	1.1	14.9
Net operating cash flows of discontinued operations	0	(0.5)
Effect of exchange rate changes on cash and cash equivalents	0	(0.2)
Net increase (decrease) in cash and cash equivalents	1.1	14.2
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
Capital expenditures		0
Payments for (Proceeds from) Other Investing Activities	0
Net cash used in investing activities from continuing operations	0	0
Financing activities:
Proceeds from the issuance of common stock	0	0
Proceeds from the issuance of long-term debt		0
Debt issuance costs paid	0	0
Purchase of treasury stock		0
Repayment of debt	0	0
Financing from affiliated companies	0	0
Other, net	0	0
Net cash provided by 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
Net increase (decrease) in cash and cash equivalents	$ 0	$ 0