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Financial Instruments and Fair Value Measurements - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
swap
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment balances $ 4,300,000 $ 2,800,000  
Gain (loss) related to hedge ineffectiveness 0 0 $ 0
Accumulated unrealized gains (losses), net of income taxes (4,100,000) $ 8,900,000  
Amount expected to be reclassified from other comprehensive loss into earnings $ 2,800,000    
Interest Rate Swaps      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of additional forward interest rate swaps | swap 18    
Notional value $ 546,200,000    
Weighted average derivative interest rate 2.20%    
Forward Interest Rate Swaps      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of additional forward interest rate swaps | swap 8    
Notional value $ 450,000,000.0    
Weighted average derivative interest rate 1.70%