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Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020	Feb. 26, 2020	Mar. 18, 2019	Mar. 11, 2019
Equity, Class of Treasury Stock [Line Items]
Weighted average common shares outstanding	1,122,000	751,000	1,887,000	841,000
Conversion of debentures			0
Conversion price							$ 188.73
Market price	$ 91.10	$ 146.30	$ 91.10	$ 146.30
Foreign currency translation gain	$ 47.0	$ 56.9	$ 19.4	$ 60.9
Stock repurchase program, authorized amount	$ 239.8		$ 239.8
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized					10,000,000.0	5,000,000.0
Stock repurchase program, authorized amount					$ 375.0	$ 250.0		$ 120.0