Guarantor Financial Statements - Condensed Consolidating Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Jun. 28, 2014		Dec. 31, 2013		Jun. 29, 2013	Dec. 31, 2012
Current Assets:
Unrestricted cash and cash equivalents	$ 91.3		$ 80.9		$ 48.8	$ 144.7
Restricted cash	0.9		2.9
Accounts receivable, less allowances	410.2		276.4
Intercompany receivables	0		0
Inventories, net	365.4		270.5
Prepaid expenses	18.9		20.2
Other current assets	16.1		19.4
Deferred tax assets	30.8		29.7
Total current assets	933.6		700.0
Property and Equipment, at Cost:
Total property and equipment, net	248.4		232.4
Other Long-term Assets:
Investment in subsidiaries and long-term receivable from (to) subsidiaries	0		0
Goodwill	479.7	[1]	373.5	[1]
Intangible assets, less accumulated amortization	662.7		648.9
Deferred tax asset	0		0
Other assets	38.5		36.1
Total other long-term assets	1,180.9		1,058.5
Total Assets	2,362.9		1,990.9
Current Liabilities:
Short-term bank obligations	0.6		0.7
Current maturities of long-term debt	21.2		2.8
Accounts payable	314.1		214.7
Accrued expenses and taxes, net	227.0		231.5
Current deferred taxes	0		0
Intercompany payables	0		0
Total current liabilities	562.9		449.7
Other Liabilities:
Deferred income taxes	134.8		159.1
Other long-term liabilities	192.4		188.9
Long-term intercompany payables	0		0
Total other long-term liabilities	327.2		348.0
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	1,424.4		1,093.3
Stockholders' investment (deficit)	48.4		99.9
Total Liabilities and Stockholders' Investment	2,362.9		1,990.9
Nortek [Member]
Current Assets:
Unrestricted cash and cash equivalents	37.5		23.2		12.0	94.9
Restricted cash	0.9		2.7
Accounts receivable, less allowances	0		0.1
Intercompany receivables	0.5		1.4
Inventories, net	0		0
Prepaid expenses	3.2		3.2
Other current assets	0.9		0.1
Deferred tax assets	3.5		4.8
Total current assets	46.5		35.5
Property and Equipment, at Cost:
Total property and equipment, net	10.5		7.0
Other Long-term Assets:
Investment in subsidiaries and long-term receivable from (to) subsidiaries	1,476.8		1,180.7
Goodwill	0		0
Intangible assets, less accumulated amortization	0		0
Deferred tax asset	10.5		10.2
Other assets	23.3		20.3
Total other long-term assets	1,510.6		1,211.2
Total Assets	1,567.6		1,253.7
Current Liabilities:
Short-term bank obligations	0		0
Current maturities of long-term debt	18.8		0.3
Accounts payable	5.9		2.3
Accrued expenses and taxes, net	41.8		36.2
Current deferred taxes	0		0
Intercompany payables	0		0
Total current liabilities	66.5		38.8
Other Liabilities:
Deferred income taxes	0		0
Other long-term liabilities	37.1		31.7
Long-term intercompany payables	0		0
Total other long-term liabilities	37.1		31.7
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	1,415.6		1,083.3
Stockholders' investment (deficit)	48.4		99.9
Total Liabilities and Stockholders' Investment	1,567.6		1,253.7
Guarantor Subsidiaries [Member]
Current Assets:
Unrestricted cash and cash equivalents	14.1		20.0		10.2	13.1
Restricted cash	0		0.1
Accounts receivable, less allowances	341.6		219.2
Intercompany receivables	0		0
Inventories, net	279.6		204.5
Prepaid expenses	9.8		11.0
Other current assets	4.3		6.5
Deferred tax assets	27.8		26.3
Total current assets	677.2		487.6
Property and Equipment, at Cost:
Total property and equipment, net	167.2		157.4
Other Long-term Assets:
Investment in subsidiaries and long-term receivable from (to) subsidiaries	330.5		418.6
Goodwill	448.2		357.8
Intangible assets, less accumulated amortization	600.8		627.1
Deferred tax asset	0		0
Other assets	14.4		14.6
Total other long-term assets	1,393.9		1,418.1
Total Assets	2,238.3		2,063.1
Current Liabilities:
Short-term bank obligations	0		0
Current maturities of long-term debt	2.4		2.5
Accounts payable	171.4		103.7
Accrued expenses and taxes, net	139.1		152.4
Current deferred taxes	0		0
Intercompany payables	67.5		61.9
Total current liabilities	380.4		320.5
Other Liabilities:
Deferred income taxes	128.9		163.8
Other long-term liabilities	134.1		135.6
Long-term intercompany payables	0		0
Total other long-term liabilities	263.0		299.4
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	8.8		10.0
Stockholders' investment (deficit)	1,586.1		1,433.2
Total Liabilities and Stockholders' Investment	2,238.3		2,063.1
Non-Guarantor Subsidiaries [Member]
Current Assets:
Unrestricted cash and cash equivalents	39.7		37.7		26.6	36.7
Restricted cash	0		0.1
Accounts receivable, less allowances	68.6		57.1
Intercompany receivables	67.0		60.5
Inventories, net	93.9		72.0
Prepaid expenses	5.9		6.0
Other current assets	10.9		12.8
Deferred tax assets	0		0
Total current assets	286.0		246.2
Property and Equipment, at Cost:
Total property and equipment, net	70.7		68.0
Other Long-term Assets:
Investment in subsidiaries and long-term receivable from (to) subsidiaries	0		0
Goodwill	31.5		15.7
Intangible assets, less accumulated amortization	71.9		32.2
Deferred tax asset	0		0
Other assets	0.8		1.2
Total other long-term assets	104.2		49.1
Total Assets	460.9		363.3
Current Liabilities:
Short-term bank obligations	0.6		0.7
Current maturities of long-term debt	0		0
Accounts payable	136.8		108.7
Accrued expenses and taxes, net	46.1		42.9
Current deferred taxes	0.5		1.4
Intercompany payables	0		0
Total current liabilities	184.0		153.7
Other Liabilities:
Deferred income taxes	19.5		7.7
Other long-term liabilities	21.2		21.6
Long-term intercompany payables	125.8		49.4
Total other long-term liabilities	166.5		78.7
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	0		0
Stockholders' investment (deficit)	110.4		130.9
Total Liabilities and Stockholders' Investment	460.9		363.3
Eliminations [Member]
Current Assets:
Unrestricted cash and cash equivalents	0		0
Restricted cash	0		0
Accounts receivable, less allowances	0		0
Intercompany receivables	(67.5)		(61.9)
Inventories, net	(8.1)		(6.0)
Prepaid expenses	0		0
Other current assets	0		0
Deferred tax assets	(0.5)		(1.4)
Total current assets	(76.1)		(69.3)
Property and Equipment, at Cost:
Total property and equipment, net	0		0
Other Long-term Assets:
Investment in subsidiaries and long-term receivable from (to) subsidiaries	(1,807.3)		(1,599.3)
Goodwill	0		0
Intangible assets, less accumulated amortization	(10.0)		(10.4)
Deferred tax asset	(10.5)		(10.2)
Other assets	0		0
Total other long-term assets	(1,827.8)		(1,619.9)
Total Assets	(1,903.9)		(1,689.2)
Current Liabilities:
Short-term bank obligations	0		0
Current maturities of long-term debt	0		0
Accounts payable	0		0
Accrued expenses and taxes, net	0		0
Current deferred taxes	(0.5)		(1.4)
Intercompany payables	(67.5)		(61.9)
Total current liabilities	(68.0)		(63.3)
Other Liabilities:
Deferred income taxes	(13.6)		(12.4)
Other long-term liabilities	0		0
Long-term intercompany payables	(125.8)		(49.4)
Total other long-term liabilities	(139.4)		(61.8)
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	0		0
Stockholders' investment (deficit)	(1,696.5)		(1,564.1)
Total Liabilities and Stockholders' Investment	$ (1,903.9)		$ (1,689.2)

[1] The CES reporting unit did not have goodwill for any periods presented.