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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets    
Available-for-sale investments $ 837.0 $ 793.8
Bank time deposits    
Assets    
Available-for-sale investments 33.3 13.1
Corporate debt securities    
Assets    
Available-for-sale investments 471.9 489.2
Asset-backed securities    
Assets    
Available-for-sale investments 137.2 141.7
U.S. government and agency securities    
Assets    
Available-for-sale investments 132.8 113.8
Foreign government bonds    
Assets    
Available-for-sale investments 1.7 1.7
Commercial paper    
Assets    
Available-for-sale investments 60.1 34.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 13.4 32.4
Investments held for deferred compensation plans 97.8 88.9
Derivatives 27.5 30.7
Assets 975.7 945.8
Liabilities    
Derivatives 21.4 6.4
Deferred compensation plans 97.8 88.7
Contingent consideration liabilities 180.9 172.5
Liabilities 300.1 267.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments 33.3 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 471.9 489.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 137.2 141.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 132.8 113.8
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 60.1 34.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 2.3 0.7
Investments held for deferred compensation plans 97.8 88.9
Derivatives 0.0 0.0
Assets 157.8 165.7
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 97.8 88.7
Contingent consideration liabilities 0.0 0.0
Liabilities 97.8 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 57.7 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 11.1 31.7
Investments held for deferred compensation plans 0.0 0.0
Derivatives 27.5 30.7
Assets 817.9 780.1
Liabilities    
Derivatives 21.4 6.4
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Liabilities 21.4 6.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments 33.3 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 471.9 489.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 137.2 141.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 75.1 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 60.1 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 180.9 172.5
Liabilities 180.9 172.5
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