Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020		Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 311,922,787	$ 311,922,787	[1]		$ 311,922,787
Acquisitions					0
Amortization of intangible assets	5,600,000			$ 5,600,000	11,200,000	$ 11,200,000
Amortization expense, remainder of fiscal year	22,000,000				22,000,000
Amortization expense, year one	22,000,000				22,000,000
Amortization expense, year two	19,000,000				19,000,000
Amortization expense, year three	16,000,000				16,000,000
Amortization expense, year four	$ 12,000,000				$ 12,000,000
HomeLink®
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 307,400,000
Vaporsens Inc
Finite-Lived Intangible Assets [Line Items]
Acquisitions				$ 3,700,000
Argil, Inc.
Finite-Lived Intangible Assets [Line Items]
Acquisitions		$ 900,000

[1] The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.