Foreign Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Foreign operations data
Revenues	$ 1,257,400,000	$ 1,209,200,000	$ 1,202,100,000
Foreign Operations (Textual) [Abstract]
Maximum percentage of consolidated revenues derive from any individual foreign country	10.00%
Percentage of company's identifiable assets	10.00%
Assets of Continuing Operations	$ 9,541,700,000	8,937,600,000	7,994,000,000
Foreign [Member]
Foreign operations data
Revenues	468,500,000	374,900,000	331,100,000
Foreign Operations (Textual) [Abstract]
Assets of Continuing Operations	3,783,300,000	3,438,600,000	2,624,500,000
United States [Member]
Foreign operations data
Revenues	788,900,000	834,300,000	871,000,000.0
Foreign Operations (Textual) [Abstract]
Assets of Continuing Operations	$ 5,758,400,000	$ 5,499,000,000	$ 5,369,500,000