Acquisitions (Details) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	Feb. 01, 2019	Aug. 01, 2018	Feb. 01, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2017
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 54,200	$ 862,100	$ 250,000	$ 54,179	$ 0	$ 0
Business Combination Purchase Price Canadian Dollars			1,125,000
Business Combination, Consideration Transferred			906,700	363,800
Assets Acquired and Liabilities Assumed, Cash and Cash Equivalents			21,600					$ 4,600
Assets Acquired and Liabilities Assumed, Current Assets		14,400	333,400					5,200
Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		21,300	438,000					275,000
Assets Acquired and Liabilities Assumed, Intangible Assets		9,700	124,300					70,200
Assets Acquired and Liabilities Assumed, Goodwill		10,800	194,800					13,800
Assets Acquired and Liabilities Assumed, Current Liabilities		$ (2,000)	(87,400)					$ (5,000)
Revenues					17,714,666	14,251,299	$ 10,535,700
Contingent Consideration, Working Capital Settlement			30,600
Consideration Transferred, Liabilities Incurred			(7,400)
Equity awards issued on PCLI acquisition			6,600			6,600
Assets Acquired and Liabilities Assumed, Noncurrent Liabilities			$ (118,000)
Acquisition and Integration Costs				$ 27,900	3,600	$ 27,900
Business Combination Acquiree [Member]
Business Acquisition [Line Items]
Revenues					26,900
Income Before Income Taxes					$ 1,200
Subsequent Event [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 660,000