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Financial Instruments and Fair Value - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Oct. 31, 2018
CHF (SFr)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
CHF (SFr)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jul. 18, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Equity method investments             $ 20.0 $ 18.8    
Loss on cash flow hedge, net of tax benefit       $ 39.2 $ 0.0          
Tax benefit on loss on cash flow hedge       11.4            
Aratana                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Maximum aggregate contingent payment                   $ 12.0
Prevtec                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Maximum aggregate contingent payment                 $ 16.3  
Cross-currency fixed interest rate swap | Not Designated as Hedging Instrument                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Notional amount (USD, CHF)             898.4 $ 861.2    
Cross-currency fixed interest rate swap | Not Designated as Hedging Instrument | Other Operating Income (Expense)                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Net gain (loss) on derivative instruments       (28.0) 8.0          
Cross-currency fixed interest rate swap | Net Investment Hedging | Designated as Hedging Instrument                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Notional amount (USD, CHF) | SFr     SFr 750,000,000     SFr 190,000,000        
Term of contract     5 years              
Gain, net of tax       23.3 12.2          
Derivative instruments liquidated for cash benefit (as a percent)   75.00%                
Cash benefit for liquidation   $ 26.7                
Interest included in cash benefit   $ 1.5                
Cross-currency fixed interest rate swap | Net Investment Hedging | Designated as Hedging Instrument | Subsequent Event                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Cash benefit for liquidation $ 8.3                  
Cross-currency fixed interest rate swap | Net Investment Hedging | Designated as Hedging Instrument | Interest Expense                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Amount offsetting interest expense       $ 6.0 $ 6.1          
Forward-starting interest rate contracts designated as cash flow hedges | Cash Flow Hedging | Designated as Hedging Instrument                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Notional amount (USD, CHF)             $ 4,050.0