Condensed consolidating guarantor financial information Condensed consolidating balance sheets (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 325,010	$ 303,236	$ 237,382	$ 431,984
Accounts receivable, net	286,371	273,704
Accounts receivable from consolidated subsidiaries	0	0
Inventories, net	347,095	335,593
Prepaid expenses and other current assets	34,659	35,697
Prepaid taxes	46,008	40,256
Deferred tax assets	56,294	57,301
Assets held for sale	7,072	7,422
Total current assets	1,102,509	1,053,209
Property, plant and equipment, net	315,536	317,435
Goodwill	1,317,874	1,323,553
Intangible assets, net	1,185,517	1,216,720
Investments in affiliates	401	1,150
Deferred tax assets	1,134	1,178
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	61,191	64,010
Total assets	3,984,162	3,977,255
Current liabilities
Current borrowings	415,991	368,401
Accounts payable	74,364	64,100
Accounts payable to consolidated subsidiaries	0	0
Accrued expenses	65,843	72,383
Current portion of contingent consideration	5,802	11,276
Payroll and benefit-related liabilities	69,564	85,442
Accrued interest	7,991	9,169
Income taxes payable	11,700	13,768
Other current liabilities	10,631	10,360
Total current liabilities	661,886	634,899
Long-term borrowings	696,000	700,000
Deferred tax liabilities	433,257	451,541
Pension and other postretirement benefit liabilities	161,036	167,241
Noncurrent liability for uncertain tax positions	50,547	50,884
Notes payable and other amounts due from consolidated subsidiaries	0	0
Other liabilities	61,429	58,991
Total liabilities	2,064,155	2,063,556
Total common shareholders' equity	1,917,779	1,911,309
Noncontrolling interest	2,228	2,390
Total equity	1,920,007	1,913,699	1,984,379	1,916,016
Total liabilities and equity	3,984,162	3,977,255
Consolidation, Eliminations
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	3,938	3,855
Accounts receivable from consolidated subsidiaries	(2,524,702)	(2,612,090)
Inventories, net	(28,977)	(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	(2,546,232)	(2,628,013)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Investments in affiliates	(6,989,606)	(7,060,092)
Deferred tax assets	(54,331)	(56,601)
Notes receivable and other amounts due from consolidated subsidiaries	(2,760,597)	(2,499,680)
Other assets	0	0
Total assets	(12,350,766)	(12,244,386)
Current liabilities
Current borrowings	0	0
Accounts payable	0	0
Accounts payable to consolidated subsidiaries	(2,524,702)	(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	(1,136)	134
Other current liabilities	0	0
Total current liabilities	(2,525,838)	(2,611,956)
Long-term borrowings	0	0
Deferred tax liabilities	(54,330)	(56,600)
Pension and other postretirement benefit liabilities	0	0
Noncurrent liability for uncertain tax positions	0	0
Notes payable and other amounts due from consolidated subsidiaries	(2,760,597)	(2,499,680)
Other liabilities	0	0
Total liabilities	(5,340,765)	(5,168,236)
Total common shareholders' equity	(7,010,001)	(7,076,150)
Noncontrolling interest	0	0
Total equity	(7,010,001)	(7,076,150)
Total liabilities and equity	(12,350,766)	(12,244,386)
Parent Company
Current assets
Cash and cash equivalents	26,063	27,996	31,283	42,749
Accounts receivable, net	2,521	2,346
Accounts receivable from consolidated subsidiaries	13,805	35,996
Inventories, net	0	0
Prepaid expenses and other current assets	12,261	14,301
Prepaid taxes	27,334	23,493
Deferred tax assets	30,683	30,248
Assets held for sale	2,901	2,901
Total current assets	115,568	137,281
Property, plant and equipment, net	3,249	3,489
Goodwill	0	0
Intangible assets, net	0	0
Investments in affiliates	5,565,400	5,680,328
Deferred tax assets	51,481	52,244
Notes receivable and other amounts due from consolidated subsidiaries	1,187,753	1,009,686
Other assets	27,216	27,999
Total assets	6,950,667	6,911,027
Current liabilities
Current borrowings	370,091	363,701
Accounts payable	2,369	1,449
Accounts payable to consolidated subsidiaries	2,284,828	2,259,891
Accrued expenses	16,231	17,149
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	20,696	20,693
Accrued interest	7,971	9,152
Income taxes payable	0	0
Other current liabilities	1,851	5
Total current liabilities	2,704,037	2,672,040
Long-term borrowings	696,000	700,000
Deferred tax liabilities	0	0
Pension and other postretirement benefit liabilities	106,789	110,830
Noncurrent liability for uncertain tax positions	12,099	11,431
Notes payable and other amounts due from consolidated subsidiaries	1,492,235	1,483,984
Other liabilities	21,728	21,433
Total liabilities	5,032,888	4,999,718
Total common shareholders' equity	1,917,779	1,911,309
Noncontrolling interest	0	0
Total equity	1,917,779	1,911,309
Total liabilities and equity	6,950,667	6,911,027
Guarantor Subsidiaries
Current assets
Cash and cash equivalents	298	0	3,235	14,500
Accounts receivable, net	2,785	2,422
Accounts receivable from consolidated subsidiaries	2,230,679	2,303,284
Inventories, net	207,099	204,335
Prepaid expenses and other current assets	4,897	4,786
Prepaid taxes	0	0
Deferred tax assets	16,408	17,387
Assets held for sale	0	0
Total current assets	2,462,166	2,532,214
Property, plant and equipment, net	173,196	170,054
Goodwill	704,858	703,663
Intangible assets, net	727,859	743,222
Investments in affiliates	1,403,623	1,359,661
Deferred tax assets	0	0
Notes receivable and other amounts due from consolidated subsidiaries	1,572,844	1,489,994
Other assets	7,287	6,801
Total assets	7,051,833	7,005,609
Current liabilities
Current borrowings	0	0
Accounts payable	34,416	32,692
Accounts payable to consolidated subsidiaries	197,490	188,908
Accrued expenses	20,341	21,479
Current portion of contingent consideration	5,802	11,276
Payroll and benefit-related liabilities	16,054	27,228
Accrued interest	0	0
Income taxes payable	0	0
Other current liabilities	3,225	3,065
Total current liabilities	277,328	284,648
Long-term borrowings	0	0
Deferred tax liabilities	444,282	462,274
Pension and other postretirement benefit liabilities	34,917	35,074
Noncurrent liability for uncertain tax positions	15,694	15,569
Notes payable and other amounts due from consolidated subsidiaries	1,087,952	915,163
Other liabilities	26,717	24,900
Total liabilities	1,886,890	1,737,628
Total common shareholders' equity	5,164,943	5,267,981
Noncontrolling interest	0	0
Total equity	5,164,943	5,267,981
Total liabilities and equity	7,051,833	7,005,609
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	298,649	275,240	$ 202,864	$ 374,735
Accounts receivable, net	277,127	265,081
Accounts receivable from consolidated subsidiaries	280,218	272,810
Inventories, net	168,973	154,544
Prepaid expenses and other current assets	13,992	13,102
Prepaid taxes	18,674	16,763
Deferred tax assets	9,203	9,666
Assets held for sale	4,171	4,521
Total current assets	1,071,007	1,011,727
Property, plant and equipment, net	139,091	143,892
Goodwill	613,016	619,890
Intangible assets, net	457,658	473,498
Investments in affiliates	20,984	21,253
Deferred tax assets	3,984	5,535
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	26,688	29,210
Total assets	2,332,428	2,305,005
Current liabilities
Current borrowings	45,900	4,700
Accounts payable	37,579	29,959
Accounts payable to consolidated subsidiaries	42,384	163,291
Accrued expenses	29,271	33,755
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	32,814	37,521
Accrued interest	20	17
Income taxes payable	12,836	13,634
Other current liabilities	5,555	7,290
Total current liabilities	206,359	290,167
Long-term borrowings	0	0
Deferred tax liabilities	43,305	45,867
Pension and other postretirement benefit liabilities	19,330	21,337
Noncurrent liability for uncertain tax positions	22,754	23,884
Notes payable and other amounts due from consolidated subsidiaries	180,410	100,533
Other liabilities	12,984	12,658
Total liabilities	485,142	494,446
Total common shareholders' equity	1,845,058	1,808,169
Noncontrolling interest	2,228	2,390
Total equity	1,847,286	1,810,559
Total liabilities and equity	$ 2,332,428	$ 2,305,005