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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Assets    
Available-for-sale investments: $ 1,309.3 $ 1,481.0
Corporate debt securities    
Assets    
Available-for-sale investments: 910.0 980.3
Asset-backed securities    
Assets    
Available-for-sale investments: 293.0 366.6
United States government and agency securities    
Assets    
Available-for-sale investments: 103.7 131.6
Municipal securities    
Assets    
Available-for-sale investments: 2.6 2.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 9.0 0.4
Investments held for deferred compensation plans 117.8 112.1
Derivatives 51.7 65.5
Assets 1,487.8 1,659.0
Liabilities    
Derivatives 23.4 27.2
Contingent consideration liabilities 26.9 26.2
Other liability 14.0 14.0
Liabilities 64.3 67.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments: 910.0 980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments: 293.0 366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | United States government and agency securities    
Assets    
Available-for-sale investments: 103.7 131.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities    
Assets    
Available-for-sale investments: 2.6 2.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 9.0 0.4
Investments held for deferred compensation plans 117.8 112.1
Derivatives 0.0 0.0
Assets 179.9 149.6
Liabilities    
Derivatives 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Other liability 0.0 0.0
Liabilities 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 | United States government and agency securities    
Assets    
Available-for-sale investments: 53.1 37.1
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 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 51.7 65.5
Assets 1,307.9 1,509.4
Liabilities    
Derivatives 23.4 27.2
Contingent consideration liabilities 0.0 0.0
Other liability 0.0 0.0
Liabilities 23.4 27.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments: 910.0 980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments: 293.0 366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | United States government and agency securities    
Assets    
Available-for-sale investments: 50.6 94.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities    
Assets    
Available-for-sale investments: 2.6 2.5
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
Contingent consideration liabilities 26.9 26.2
Other liability 14.0 14.0
Liabilities 40.9 40.2
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 | United States 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 | Municipal securities    
Assets    
Available-for-sale investments: $ 0.0 $ 0.0