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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Assets    
Trade receivables, allowances $ 66,500,000 $ 68,100,000
Property and equipment, accumulated depreciation 806,200,000 660,700,000
Finite-Lived Intangible Assets, Accumulated Amortization 295,300,000 214,800,000
Investments, Fair Value Disclosure $ 340,300,000 $ 328,600,000
Company shareholders' equity    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 51,970,307 51,549,654
Common stock, shares outstanding (in shares) 51,105,417 51,549,654
Treasury Stock, Shares 864,890 0
Contract with Customer, Asset, Allowance for Credit Loss, Current $ 1,800,000 $ 0
Line of Credit [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense 8,700,000 12,300,000
Long-Term Senior Notes [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 2,500,000 $ 3,100,000