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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, 2020
Dec. 31, 2019
Assets    
Available-for-sale investments $ 935.9 $ 793.8
Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Cash equivalents 16.2 32.4
Investments held for deferred compensation plans 111.2 88.9
Derivatives 8.1 30.7
Total assets 1,071.3 945.8
Liabilities    
Derivatives 39.3 6.4
Deferred compensation plans 111.6 88.7
Contingent consideration liabilities 186.1 172.5
Total liabilities 337.0 267.6
Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Cash equivalents 16.2 0.7
Investments held for deferred compensation plans 111.2 88.9
Derivatives 0.0 0.0
Total assets 184.3 165.7
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 111.6 88.7
Contingent consideration liabilities 0.0 0.0
Total liabilities 111.6 88.7
Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Cash equivalents 0.0 31.7
Investments held for deferred compensation plans 0.0 0.0
Derivatives 8.1 30.7
Total assets 887.0 780.1
Liabilities    
Derivatives 39.3 6.4
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Total liabilities 39.3 6.4
Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
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 186.1 172.5
Total liabilities 186.1 172.5
Bank time deposits    
Assets    
Available-for-sale investments 24.1 13.1
Bank time deposits | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 24.1 13.1
Bank time deposits | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Bank time deposits | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 24.1 13.1
Bank time deposits | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Corporate debt securities    
Assets    
Available-for-sale investments 608.3 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 608.3 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Corporate debt securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 608.3 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Asset-backed securities    
Assets    
Available-for-sale investments 151.5 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 151.5 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Asset-backed securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 151.5 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
U.S. government and agency securities    
Assets    
Available-for-sale investments 149.2 113.8
U.S. government and agency securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 149.1 113.8
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 56.9 76.1
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 92.2 37.7
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0 0.0
Municipal securities    
Assets    
Available-for-sale investments 2.8 0.0
Municipal securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 2.8  
Municipal securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0  
Municipal securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 2.8  
Municipal securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments 0.0  
Foreign government bonds    
Assets    
Available-for-sale investments 0.0 1.7
Foreign government bonds | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   1.7
Foreign government bonds | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   0.0
Foreign government bonds | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   1.7
Foreign government bonds | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   0.0
Commercial paper    
Assets    
Available-for-sale investments $ 0.0 34.3
Commercial paper | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   34.3
Commercial paper | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   0.0
Commercial paper | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   34.3
Commercial paper | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement    
Assets    
Available-for-sale investments   $ 0.0