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Financial Instruments - Narrative (Details)
$ in Millions, SFr in Billions
12 Months Ended
Jan. 08, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 07, 2020
CHF (SFr)
Apr. 20, 2020
USD ($)
Apr. 20, 2019
USD ($)
Apr. 20, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Realized gains on foreign exchange contracts   $ 18.5 $ 16.5 $ 17.0        
Realized losses on foreign exchange contracts   11.5 24.4 24.0        
Accumulated unrealized gains on foreign exchange contracts   2.5 1.6 0.9        
Accumulated unrealized losses on foreign exchange contracts   1.0 2.6 $ 0.5        
Interest Rate Swap                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Notional amount of derivative   129.0 214.0     $ 129.0 $ 214.0 $ 300.0
Foreign Exchange Contract                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Notional amount of derivative   229.2 $ 152.0   SFr 4.8      
Accumulated unrealized gains on foreign exchange contracts   $ 23.5            
Foreign Exchange Contract | Subsequent Event                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Realized gains on foreign exchange contracts $ 21.0