Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands				12 Months Ended
	Oct. 02, 2018	Jul. 03, 2018	Apr. 03, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities				$ 325,773	$ 62,756	$ 531,905
Cash flows from investing activities:
Purchases of investments				(676)	(6,722)	(24)
Sales and maturities of investments				4,287	13,069	739
Cash paid for acquisitions of businesses, net of cash acquired				(20,859)	12,319	(22,278)
Capital expenditures				(458,938)	(574,467)	(395,455)
Proceeds from sales of assets and insurance claims				109,098	57,933	34,831
Net cash (used for) provided by investing activities				(367,088)	(497,868)	(382,187)
Cash flows from financing activities:
Debt issuance costs				(21,277)	(11,043)	(11,520)
Proceeds from (payments for) issuance of common shares				301,404	8,300	967
Reduction of long-term debt				(878,278)	(381,814)	(493,612)
Dividends to shareholders	$ (21,400)	$ (21,500)	$ (19,100)		(68,503)	(50,924)
Proceeds from (payments for) commercial paper, net				(40,000)	40,000	(8,000)
Purchase of capped call hedge transactions					(40,250)
Proceeds from revolving credit facilities				1,135,000	725,000	611,500
Reduction in revolving credit facilities				(1,475,000)	(215,000)	(611,500)
Dividends to common and preferred shareholders				(87,098)	(68,503)	(50,924)
Proceeds from (payments for) short-term borrowings				380	(543)	(6,211)
Proceeds from issuance of preferred stock, net of issuance costs				277,927
Proceeds from issuance of long-term debt				800,000	411,200	600,000
Payments on term loan					(162,500)	(162,500)
Cash proceeds (payments) from equity component of exchangeable debt					159,952
Noncontrolling interest contribution					20,000
Distributions to noncontrolling interest				(5,452)	(7,272)
Other changes				(8,912)	(8,399)	(4,729)
Repurchase of common shares					(18,071)	(1,687)
Redeemable noncontrolling interest contribution				156,935	61,123
Net cash provided by financing activities				155,629	512,180	(138,216)
Effect of exchange rate changes on cash and cash equivalents				(5,263)	(29)	(2,003)
Net increase (decrease) in cash, cash equivalents and restricted cash				109,051	77,039	9,499
Cash and cash equivalents and restricted cash, beginning of period				342,029	264,990	255,491
Cash and cash equivalents and restricted cash, end of period				451,080	342,029	264,990
Consolidating Adjustments
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities				(47,497)	(132,986)	(50,423)
Cash flows from investing activities:
Cash paid for investments in consolidated affiliates				794,000	(86,060)	245,459
Net cash (used for) provided by investing activities				794,000	86,060	245,459
Cash flows from financing activities:
Dividends to shareholders					11,916	8,942
Dividends to common and preferred shareholders				12,485
Proceeds from parent contributions				(794,000)	(86,060)	(245,458)
Distribution from subsidiary to parent				35,012	121,070	41,480
Net cash provided by financing activities				(746,503)	46,926	(195,036)
Parent Company | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities				86,504	143,444	58,406
Cash flows from investing activities:
Cash paid for investments in consolidated affiliates				(587,500)	100
Net cash (used for) provided by investing activities				(587,500)	(100)
Cash flows from financing activities:
Proceeds from (payments for) issuance of common shares				301,404	8,299	967
Dividends to shareholders					(80,419)	(59,866)
Proceeds from issuance of intercompany debt				45,500	57,000
Dividends to common and preferred shareholders				(99,583)
Proceeds from issuance of preferred stock, net of issuance costs				277,927
Paydown of intercompany debt				(21,000)	(102,000)	(40,000)
Other changes				(3,869)	(8,210)	(4,732)
Repurchase of common shares					(18,071)
Proceeds (issuance) of intercompany debt						45,500
Net cash provided by financing activities				500,379	(143,401)	(58,131)
Net increase (decrease) in cash, cash equivalents and restricted cash				(617)	(57)	275
Cash and cash equivalents and restricted cash, beginning of period				1,091	1,148	873
Cash and cash equivalents and restricted cash, end of period				474	1,091	1,148
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities				(208,943)	(90,229)	(233,738)
Cash flows from investing activities:
Cash paid for acquisitions of businesses, net of cash acquired				(20,859)
Cash paid for investments in consolidated affiliates						(86,459)
Change in intercompany balances				502,856	(599,974)	103,384
Net cash (used for) provided by investing activities				481,997	(599,974)	16,925
Cash flows from financing activities:
Debt issuance costs				(21,277)	(11,043)	(11,520)
Reduction of long-term debt				(878,278)	(270,269)	(350,000)
Proceeds from (payments for) commercial paper, net				(40,000)	40,000	(8,000)
Proceeds from issuance of intercompany debt					20,000
Purchase of capped call hedge transactions					(40,250)
Proceeds from revolving credit facilities				1,135,000	725,000	610,000
Reduction in revolving credit facilities				(1,475,000)	(215,000)	(610,000)
Proceeds from issuance of long-term debt				800,000	411,200	600,000
Payments on term loan					(162,500)	(162,500)
Paydown of intercompany debt					(20,000)
Cash proceeds (payments) from equity component of exchangeable debt					159,952
Proceeds from parent contributions				206,500	42,980	159,000
Net cash provided by financing activities				(273,055)	680,070	226,980
Net increase (decrease) in cash, cash equivalents and restricted cash				(1)	(10,133)	10,167
Cash and cash equivalents and restricted cash, beginning of period				44	10,177	10
Cash and cash equivalents and restricted cash, end of period				43	44	10,177
Other Subsidiaries (Non-Guarantors) | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities				495,709	142,527	757,660
Cash flows from investing activities:
Purchases of investments				(676)	(6,722)	(24)
Sales and maturities of investments				4,287	13,069	739
Cash paid for acquisitions of businesses, net of cash acquired					12,319	(22,278)
Cash paid for investments in consolidated affiliates				(206,500)	85,960	(159,000)
Capital expenditures				(458,938)	(574,467)	(395,455)
Proceeds from sales of assets and insurance claims				109,098	57,933	34,831
Change in intercompany balances				(502,856)	599,974	(103,384)
Net cash (used for) provided by investing activities				(1,055,585)	16,146	(644,571)
Cash flows from financing activities:
Proceeds from (payments for) issuance of common shares					1
Reduction of long-term debt					(111,545)	(143,612)
Proceeds from issuance of intercompany debt				(45,500)	(77,000)
Proceeds from revolving credit facilities						1,500
Reduction in revolving credit facilities						(1,500)
Proceeds from (payments for) short-term borrowings				380	(543)	(6,211)
Paydown of intercompany debt				21,000	122,000	40,000
Noncontrolling interest contribution					20,000
Distributions to noncontrolling interest				(5,452)	(7,272)
Proceeds from parent contributions				587,500	43,080	86,458
Distribution from subsidiary to parent				(35,012)	(121,070)	(41,480)
Other changes				(5,043)	(189)	3
Repurchase of common shares						(1,687)
Redeemable noncontrolling interest contribution				156,935	61,123
Proceeds (issuance) of intercompany debt						(45,500)
Net cash provided by financing activities				674,808	(71,415)	(112,029)
Effect of exchange rate changes on cash and cash equivalents				(5,263)	(29)	(2,003)
Net increase (decrease) in cash, cash equivalents and restricted cash				109,669	87,229	(943)
Cash and cash equivalents and restricted cash, beginning of period				340,894	253,665	254,608
Cash and cash equivalents and restricted cash, end of period				$ 450,563	$ 340,894	$ 253,665