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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
Percentage of LIFO inventory	54.00%	56.00%
Allowance for doubtful accounts receivable, current	$ 42,200,000	$ 32,700,000
Research and development expense	237,000,000.0	228,700,000	$ 210,800,000
Effect of Exchange Rate on Cash and Cash Equivalents	(9,800,000)	(45,600,000)	118,400,000
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 1,956,300,000	$ 1,474,500,000	$ 1,561,600,000
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 521,000,000
Accounting Standards Update 2016-16 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 9,100,000
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ (2,400,000)
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (15,100,000)
Maximum [Member]
Equity Method Investment, Ownership Percentage	50.00%
Minimum [Member]
Equity Method Investment, Ownership Percentage	20.00%