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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Assets      
Available-for-sale investments $ 810.7 $ 793.8  
Bank time deposits      
Assets      
Available-for-sale investments   13.1 $ 13.1
Corporate debt securities      
Assets      
Available-for-sale investments 474.4 489.2  
Asset-backed securities      
Assets      
Available-for-sale investments 155.9 141.7  
U.S. government and agency securities      
Assets      
Available-for-sale investments 115.8 113.8  
Foreign government bonds      
Assets      
Available-for-sale investments 1.7 1.7  
Commercial paper      
Assets      
Available-for-sale investments 49.8 34.3  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis      
Assets      
Cash equivalents 15.6 32.4  
Investments held for deferred compensation plans 76.5 88.9  
Derivatives 70.7 30.7  
Assets 973.5 945.8  
Liabilities      
Derivatives 6.6 6.4  
Deferred compensation plans 76.5 88.7  
Contingent consideration liabilities 170.3 172.5  
Liabilities 253.4 267.6  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits      
Assets      
Available-for-sale investments   13.1 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities      
Assets      
Available-for-sale investments 474.4 489.2  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities      
Assets      
Available-for-sale investments 155.9 141.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities      
Assets      
Available-for-sale investments 115.8 113.8  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Foreign government bonds      
Assets      
Available-for-sale investments 1.7 1.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper      
Assets      
Available-for-sale investments 49.8 34.3  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1      
Assets      
Cash equivalents 1.1 0.7  
Investments held for deferred compensation plans 76.5 88.9  
Derivatives 0.0 0.0  
Assets 137.2 165.7  
Liabilities      
Derivatives 0.0 0.0  
Deferred compensation plans 76.5 88.7  
Contingent consideration liabilities 0.0 0.0  
Liabilities 76.5 88.7  
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 59.6 76.1  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Foreign government bonds      
Assets      
Available-for-sale investments 0.0 0.0  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Commercial paper      
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 14.5 31.7  
Investments held for deferred compensation plans 0.0 0.0  
Derivatives 70.7 30.7  
Assets 836.3 780.1  
Liabilities      
Derivatives 6.6 6.4  
Deferred compensation plans 0.0 0.0  
Contingent consideration liabilities 0.0 0.0  
Liabilities 6.6 6.4  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits      
Assets      
Available-for-sale investments   13.1 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities      
Assets      
Available-for-sale investments 474.4 489.2  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities      
Assets      
Available-for-sale investments 155.9 141.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities      
Assets      
Available-for-sale investments 56.2 37.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Foreign government bonds      
Assets      
Available-for-sale investments 1.7 1.7  
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper      
Assets      
Available-for-sale investments 49.8 34.3  
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 170.3 172.5  
Liabilities 170.3 172.5  
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 | Foreign government bonds      
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 $ 0.0