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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets    
Available-for-sale investments $ 1,146.0 $ 935.9
Bank time deposits    
Assets    
Available-for-sale investments 3.0 24.1
Corporate debt securities    
Assets    
Available-for-sale investments 771.6 608.3
Asset-backed securities    
Assets    
Available-for-sale investments 212.5 151.5
U.S. government and agency securities    
Assets    
Available-for-sale investments 142.9 149.2
Commercial paper    
Assets    
Available-for-sale investments 13.2 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 99.9 16.2
Investments held for deferred compensation plans 121.5 111.2
Derivatives 32.1 8.1
Assets 1,399.5 1,071.3
Liabilities    
Derivatives 7.9 39.3
Deferred compensation plans 121.8 111.6
Contingent consideration liabilities 79.0 186.1
Other liability 14.0  
Liabilities 222.7 337.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments 3.0 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 771.6 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 212.5 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 142.9 149.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper    
Assets    
Available-for-sale investments 13.2  
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 77.8 16.2
Investments held for deferred compensation plans 121.5 111.2
Derivatives 0.0 0.0
Assets 247.5 184.3
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 121.8 111.6
Contingent consideration liabilities 0.0 0.0
Other liability 0.0  
Liabilities 121.8 111.6
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 | U.S. government and agency securities    
Assets    
Available-for-sale investments 48.2 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 22.1 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 32.1 8.1
Assets 1,152.0 887.0
Liabilities    
Derivatives 7.9 39.3
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Other liability 0.0  
Liabilities 7.9 39.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments 3.0 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 771.6 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 212.5 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 94.7 92.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper    
Assets    
Available-for-sale investments 13.2  
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
Assets 0.0 0.0
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 79.0 186.1
Other liability 14.0  
Liabilities 93.0 186.1
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 | U.S. 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