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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Available-for-sale investments: $ 2,183.7 $ 935.9
Bank time deposits    
Assets    
Available-for-sale investments: 2.5 24.1
Corporate debt securities    
Assets    
Available-for-sale investments: 1,390.8 608.3
Asset-backed securities    
Assets    
Available-for-sale investments: 512.6 151.5
United States government and agency securities    
Assets    
Available-for-sale investments: 147.3 149.2
Commercial paper    
Assets    
Available-for-sale investments: 127.7 0.0
Municipal securities    
Assets    
Available-for-sale investments: 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 45.9 16.2
Investments held for deferred compensation plans 130.7 111.2
Derivatives 55.3 8.1
Total assets 2,415.6 1,071.3
Liabilities    
Derivatives 3.9 39.3
Deferred compensation plans 130.9 111.6
Contingent consideration liabilities 62.0 186.1
Other liability 14.0  
Total liabilities 210.8 337.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments: 2.5 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments: 1,390.8 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments: 512.6 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | United States government and agency securities    
Assets    
Available-for-sale investments: 147.3 149.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper    
Assets    
Available-for-sale investments: 127.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities    
Assets    
Available-for-sale investments: 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 15.2 16.2
Investments held for deferred compensation plans 130.7 111.2
Derivatives 0.0 0.0
Total assets 174.3 184.3
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 130.9 111.6
Contingent consideration liabilities 0.0 0.0
Other liability 0.0  
Total liabilities 130.9 111.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Bank time deposits    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Corporate debt securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Asset-backed securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | United States government and agency securities    
Assets    
Available-for-sale investments: 28.4 56.9
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Commercial paper    
Assets    
Available-for-sale investments: 0.0  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Municipal securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2    
Assets    
Cash equivalents 30.7 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 55.3 8.1
Total assets 2,241.3 887.0
Liabilities    
Derivatives 3.9 39.3
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Other liability 0.0  
Total liabilities 3.9 39.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments: 2.5 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments: 1,390.8 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments: 512.6 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | United States government and agency securities    
Assets    
Available-for-sale investments: 118.9 92.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper    
Assets    
Available-for-sale investments: 127.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities    
Assets    
Available-for-sale investments: 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3    
Assets    
Cash equivalents 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 0.0 0.0
Total assets 0.0 0.0
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 62.0 186.1
Other liability 14.0  
Total liabilities 76.0 186.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Bank time deposits    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Corporate debt securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Asset-backed securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | United States government and agency securities    
Assets    
Available-for-sale investments: 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Commercial paper    
Assets    
Available-for-sale investments: 0.0  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities    
Assets    
Available-for-sale investments: $ 0.0 $ 0.0