Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Consolidated Balance Sheets (Parenthetical) [Abstract]
Allowance for doubtful accounts	$ 34,200,000	$ 21,500,000
Accumulated depreciation	1,114,600,000	1,142,800,000
Intangible assets, accumulated amortization	$ 780,900,000	$ 759,200,000