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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, 2019
Dec. 31, 2018
Assets    
Available-for-sale investments $ 529.3 $ 706.2
Corporate debt securities    
Assets    
Available-for-sale investments 356.8 455.6
Asset-backed securities    
Assets    
Available-for-sale investments 81.3 110.2
U.S. government and agency securities    
Assets    
Available-for-sale investments 76.0 79.2
Foreign government bonds    
Assets    
Available-for-sale investments 1.6 1.7
Commercial paper    
Assets    
Available-for-sale investments 10.9 56.7
Municipal securities    
Assets    
Available-for-sale investments 2.7 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 314.6 11.8
Investments held for deferred compensation plans 81.4 67.6
Derivatives 48.5 29.9
Assets 973.8 815.5
Liabilities    
Derivatives 4.4 5.2
Deferred compensation plans 82.0 68.5
Contingent consideration liabilities 191.0 178.6
Liabilities 277.4 252.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 356.8 455.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 81.3 110.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 76.0 79.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Foreign government bonds    
Assets    
Available-for-sale investments 1.6 1.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper    
Assets    
Available-for-sale investments 10.9 56.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities    
Assets    
Available-for-sale investments 2.7 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 248.1 0.0
Investments held for deferred compensation plans 81.4 67.6
Derivatives 0.0 0.0
Assets 375.0 87.2
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 82.0 68.5
Contingent consideration liabilities 0.0 0.0
Liabilities 82.0 68.5
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 45.5 19.6
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 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 66.5 11.8
Investments held for deferred compensation plans 0.0 0.0
Derivatives 48.5 29.9
Assets 598.8 728.3
Liabilities    
Derivatives 4.4 5.2
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Liabilities 4.4 5.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 356.8 455.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 81.3 110.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 30.5 59.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Foreign government bonds    
Assets    
Available-for-sale investments 1.6 1.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper    
Assets    
Available-for-sale investments 10.9 56.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities    
Assets    
Available-for-sale investments 2.7 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 191.0 178.6
Liabilities 191.0 178.6
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
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities    
Assets    
Available-for-sale investments $ 0.0 $ 0.0