Condensed consolidating guarantor financial information Condensed consolidating balance sheets (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014	Sep. 28, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 276,463	$ 303,236	$ 286,382	$ 431,984
Accounts receivable, net	272,996	273,704
Accounts receivable from consolidated subsidiaries	0	0
Inventories, net	345,899	335,593
Prepaid expenses and other current assets	33,798	35,697
Prepaid taxes	43,966	40,256
Deferred tax assets	55,981	57,301
Assets held for sale	7,044	7,422
Total current assets	1,036,147	1,053,209
Property, plant and equipment, net	313,244	317,435
Goodwill	1,303,175	1,323,553
Intangible assets, net	1,192,364	1,216,720
Investments in affiliates	324	1,150
Deferred tax assets	940	1,178
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	61,507	64,010
Total assets	3,907,701	3,977,255
Current liabilities
Current borrowings	416,685	368,401
Accounts payable	67,906	64,100
Accounts payable to consolidated subsidiaries	0	0
Accrued expenses	67,027	72,383
Current portion of contingent consideration	545	11,276
Payroll and benefit-related liabilities	77,435	85,442
Accrued interest	7,490	9,169
Income taxes payable	9,728	13,768
Other current liabilities	10,655	10,360
Total current liabilities	657,471	634,899
Long-term borrowings	646,000	700,000
Deferred tax liabilities	406,101	451,541
Pension and other postretirement benefit liabilities	148,514	167,241
Noncurrent liability for uncertain tax positions	50,817	50,884
Notes payable and other amounts due to consolidated subsidiaries	0	0
Other liabilities	57,737	58,991
Total liabilities	1,966,640	2,063,556
Total common shareholders' equity	1,938,891	1,911,309
Noncontrolling interest	2,170	2,390
Total equity	1,941,061	1,913,699	1,983,916	1,916,016
Total liabilities and equity	3,907,701	3,977,255
Consolidation, Eliminations
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	3,832	3,855
Accounts receivable from consolidated subsidiaries	(2,540,938)	(2,612,090)
Inventories, net	(27,457)	(23,286)
Prepaid expenses and other current assets	3,509	3,508
Prepaid taxes	0	0
Deferred tax assets	0	0
Assets held for sale	0	0
Total current assets	(2,561,054)	(2,628,013)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Investments in affiliates	(6,945,517)	(7,060,092)
Deferred tax assets	(54,865)	(56,601)
Notes receivable and other amounts due from consolidated subsidiaries	(2,906,015)	(2,499,680)
Other assets	0	0
Total assets	(12,467,451)	(12,244,386)
Current liabilities
Current borrowings	0	0
Accounts payable	0	0
Accounts payable to consolidated subsidiaries	(2,540,938)	(2,612,090)
Accrued expenses	0	0
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	0	0
Accrued interest	0	0
Income taxes payable	(865)	134
Other current liabilities	0	0
Total current liabilities	(2,541,803)	(2,611,956)
Long-term borrowings	0	0
Deferred tax liabilities	(54,865)	(56,600)
Pension and other postretirement benefit liabilities	0	0
Noncurrent liability for uncertain tax positions	0	0
Notes payable and other amounts due to consolidated subsidiaries	(2,906,015)	(2,499,680)
Other liabilities	0	0
Total liabilities	(5,502,683)	(5,168,236)
Total common shareholders' equity	(6,964,768)	(7,076,150)
Noncontrolling interest	0	0
Total equity	(6,964,768)	(7,076,150)
Total liabilities and equity	(12,467,451)	(12,244,386)
Parent Company
Current assets
Cash and cash equivalents	37,898	27,996	59,555	42,749
Accounts receivable, net	2,605	2,346
Accounts receivable from consolidated subsidiaries	4,488	35,996
Inventories, net	0	0
Prepaid expenses and other current assets	10,785	14,301
Prepaid taxes	26,498	23,493
Deferred tax assets	31,495	30,248
Assets held for sale	2,901	2,901
Total current assets	116,670	137,281
Property, plant and equipment, net	3,097	3,489
Goodwill	0	0
Intangible assets, net	0	0
Investments in affiliates	5,624,320	5,680,328
Deferred tax assets	52,019	52,244
Notes receivable and other amounts due from consolidated subsidiaries	1,229,950	1,009,686
Other assets	27,375	27,999
Total assets	7,053,431	6,911,027
Current liabilities
Current borrowings	373,385	363,701
Accounts payable	3,958	1,449
Accounts payable to consolidated subsidiaries	2,316,630	2,259,891
Accrued expenses	15,066	17,149
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	19,734	20,693
Accrued interest	7,472	9,152
Income taxes payable	0	0
Other current liabilities	3,517	5
Total current liabilities	2,739,762	2,672,040
Long-term borrowings	646,000	700,000
Deferred tax liabilities	0	0
Pension and other postretirement benefit liabilities	94,795	110,830
Noncurrent liability for uncertain tax positions	12,471	11,431
Notes payable and other amounts due to consolidated subsidiaries	1,600,635	1,483,984
Other liabilities	20,877	21,433
Total liabilities	5,114,540	4,999,718
Total common shareholders' equity	1,938,891	1,911,309
Noncontrolling interest	0	0
Total equity	1,938,891	1,911,309
Total liabilities and equity	7,053,431	6,911,027
Guarantor Subsidiaries
Current assets
Cash and cash equivalents	40	0	1,662	14,500
Accounts receivable, net	2,899	2,422
Accounts receivable from consolidated subsidiaries	2,260,734	2,303,284
Inventories, net	208,641	204,335
Prepaid expenses and other current assets	5,145	4,786
Prepaid taxes	0	0
Deferred tax assets	15,120	17,387
Assets held for sale	0	0
Total current assets	2,492,579	2,532,214
Property, plant and equipment, net	173,811	170,054
Goodwill	704,857	703,663
Intangible assets, net	744,141	743,222
Investments in affiliates	1,299,061	1,359,661
Deferred tax assets	0	0
Notes receivable and other amounts due from consolidated subsidiaries	1,676,065	1,489,994
Other assets	7,265	6,801
Total assets	7,097,779	7,005,609
Current liabilities
Current borrowings	0	0
Accounts payable	28,313	32,692
Accounts payable to consolidated subsidiaries	186,872	188,908
Accrued expenses	23,679	21,479
Current portion of contingent consideration	545	11,276
Payroll and benefit-related liabilities	22,109	27,228
Accrued interest	0	0
Income taxes payable	0	0
Other current liabilities	2,465	3,065
Total current liabilities	263,983	284,648
Long-term borrowings	0	0
Deferred tax liabilities	417,938	462,274
Pension and other postretirement benefit liabilities	34,912	35,074
Noncurrent liability for uncertain tax positions	15,760	15,569
Notes payable and other amounts due to consolidated subsidiaries	1,128,542	915,163
Other liabilities	24,082	24,900
Total liabilities	1,885,217	1,737,628
Total common shareholders' equity	5,212,562	5,267,981
Noncontrolling interest	0	0
Total equity	5,212,562	5,267,981
Total liabilities and equity	7,097,779	7,005,609
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	238,525	275,240	$ 225,165	$ 374,735
Accounts receivable, net	263,660	265,081
Accounts receivable from consolidated subsidiaries	275,716	272,810
Inventories, net	164,715	154,544
Prepaid expenses and other current assets	14,359	13,102
Prepaid taxes	17,468	16,763
Deferred tax assets	9,366	9,666
Assets held for sale	4,143	4,521
Total current assets	987,952	1,011,727
Property, plant and equipment, net	136,336	143,892
Goodwill	598,318	619,890
Intangible assets, net	448,223	473,498
Investments in affiliates	22,460	21,253
Deferred tax assets	3,786	5,535
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	26,867	29,210
Total assets	2,223,942	2,305,005
Current liabilities
Current borrowings	43,300	4,700
Accounts payable	35,635	29,959
Accounts payable to consolidated subsidiaries	37,436	163,291
Accrued expenses	28,282	33,755
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	35,592	37,521
Accrued interest	18	17
Income taxes payable	10,593	13,634
Other current liabilities	4,673	7,290
Total current liabilities	195,529	290,167
Long-term borrowings	0	0
Deferred tax liabilities	43,028	45,867
Pension and other postretirement benefit liabilities	18,807	21,337
Noncurrent liability for uncertain tax positions	22,586	23,884
Notes payable and other amounts due to consolidated subsidiaries	176,838	100,533
Other liabilities	12,778	12,658
Total liabilities	469,566	494,446
Total common shareholders' equity	1,752,206	1,808,169
Noncontrolling interest	2,170	2,390
Total equity	1,754,376	1,810,559
Total liabilities and equity	$ 2,223,942	$ 2,305,005