Condensed Consolidating Financial Statements - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 35.1	$ 12.6
Investing activities:
Cash paid for acquisitions, net of cash acquired	(149.4)	(373.8)
Decrease in restricted cash	0.5	3.3
Capital expenditures	(12.0)	(5.3)
Net cash used in investing activities from continuing operations	(160.9)	(375.8)
Financing activities:
Proceeds from the issuance of long-term debt	0	427.5
Proceeds from the issuance of common stock	97.0	61.1
Debt issuance costs	(1.2)	(20.6)
Borrowing under the line of credit	40.0	0
Repayment of debt	(40.8)	(2.5)
Cash paid for contingent acquisition consideration	(2.5)	0
Financing from affiliated companies	0	0
Other, net	(0.9)	1.5
Net cash provided by (used in) financing activities from continuing operations	91.6	467.0
Net cash flows of continuing operations	(34.2)	103.8
Net operating cash flows of discontinued operations	2.1	(5.3)
Effect of exchange rate changes on cash and cash equivalents	0.1	(0.2)
Net increase (decrease) in cash and cash equivalents	(32.0)	98.3
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(32.5)	(17.1)
Investing activities:
Cash paid for acquisitions, net of cash acquired	(149.4)	(373.8)
Decrease in restricted cash	(0.4)	1.3
Capital expenditures	(0.4)	(0.2)
Net cash used in investing activities from continuing operations	(150.2)	(372.7)
Financing activities:
Proceeds from the issuance of long-term debt		427.5
Proceeds from the issuance of common stock	97.0	61.1
Debt issuance costs	(1.2)	(20.6)
Borrowing under the line of credit	40.0
Repayment of debt	(40.0)	0
Cash paid for contingent acquisition consideration	0
Financing from affiliated companies	55.7	(27.0)
Other, net	(0.5)	2.0
Net cash provided by (used in) financing activities from continuing operations	151.0	443.0
Net cash flows of continuing operations	(31.7)	53.2
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	(31.7)	53.2
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	61.6	29.1
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Decrease in restricted cash	0.9	2.0
Capital expenditures	(10.1)	(3.7)
Net cash used in investing activities from continuing operations	(9.2)	(1.7)
Financing activities:
Proceeds from the issuance of long-term debt		0
Proceeds from the issuance of common stock	0
Debt issuance costs	0
Borrowing under the line of credit	0
Repayment of debt	0	(2.0)
Cash paid for contingent acquisition consideration	(2.5)
Financing from affiliated companies	(55.7)	24.9
Other, net	(0.4)	(0.5)
Net cash provided by (used in) financing activities from continuing operations	(58.6)	22.4
Net cash flows of continuing operations	(6.2)	49.8
Net operating cash flows of discontinued operations	2.1	(5.3)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(4.1)	44.5
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	6.0	0.6
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Decrease in restricted cash	0	0
Capital expenditures	(1.5)	(1.4)
Net cash used in investing activities from continuing operations	(1.5)	(1.4)
Financing activities:
Proceeds from the issuance of long-term debt		0
Proceeds from the issuance of common stock	0	0
Debt issuance costs	0	0
Borrowing under the line of credit	0
Repayment of debt	(0.8)	(0.5)
Cash paid for contingent acquisition consideration	0
Financing from affiliated companies	0	2.1
Other, net	0	0
Net cash provided by (used in) financing activities from continuing operations	(0.8)	1.6
Net cash flows of continuing operations	3.7	0.8
Net operating cash flows of discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0.1	(0.2)
Net increase (decrease) in cash and cash equivalents	3.8	0.6
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	0
Net cash used in investing activities from continuing operations	0	0
Financing activities:
Proceeds from the issuance of long-term debt		0
Proceeds from the issuance of common stock	0	0
Debt issuance costs	0	0
Borrowing under the line of credit	0
Repayment of debt	0	0
Cash paid for contingent acquisition consideration	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
Net increase (decrease) in cash and cash equivalents	$ 0	$ 0