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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, 2020
Dec. 31, 2019
Assets    
Available-for-sale investments $ 821.9 $ 793.8
Bank time deposits    
Assets    
Available-for-sale investments 33.2 13.1
Corporate debt securities    
Assets    
Available-for-sale investments 465.3 489.2
Asset-backed securities    
Assets    
Available-for-sale investments 143.2 141.7
U.S. government and agency securities    
Assets    
Available-for-sale investments 131.0 113.8
Foreign government bonds    
Assets    
Available-for-sale investments 1.7 1.7
Commercial paper    
Assets    
Available-for-sale investments 47.5 34.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 27.9 32.4
Investments held for deferred compensation plans 89.9 88.9
Derivatives 52.0 30.7
Assets 991.7 945.8
Liabilities    
Derivatives 6.4 6.4
Deferred compensation plans 90.5 88.7
Contingent consideration liabilities 189.9 172.5
Liabilities 286.8 267.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments 33.2 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 465.3 489.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 143.2 141.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 131.0 113.8
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 47.5 34.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 9.9 0.7
Investments held for deferred compensation plans 89.9 88.9
Derivatives 0.0 0.0
Assets 159.0 165.7
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 90.5 88.7
Contingent consideration liabilities 0.0 0.0
Liabilities 90.5 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 59.2 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 18.0 31.7
Investments held for deferred compensation plans 0.0 0.0
Derivatives 52.0 30.7
Assets 832.7 780.1
Liabilities    
Derivatives 6.4 6.4
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Liabilities 6.4 6.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments 33.2 13.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 465.3 489.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 143.2 141.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 71.8 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 47.5 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 189.9 172.5
Liabilities 189.9 172.5
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