Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Consolidated Balance Sheets (Parenthetical) [Abstract]
Allowance for doubtful accounts	$ 21,600,000	$ 21,500,000
Accumulated depreciation	1,130,600,000	1,142,800,000
Intangible assets, accumulated amortization	$ 749,400,000	$ 759,200,000