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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, 2018
Dec. 31, 2017
Assets    
Available-for-sale investments $ 577.5 $ 683.2
Bank time deposits    
Assets    
Available-for-sale investments 0.5 0.5
Corporate debt securities    
Assets    
Available-for-sale investments 386.5 445.5
Asset-backed securities    
Assets    
Available-for-sale investments 95.9 120.8
U.S. government and agency securities    
Assets    
Available-for-sale investments 68.6 68.7
Foreign government bonds    
Assets    
Available-for-sale investments 3.0 3.0
Commercial paper    
Assets    
Available-for-sale investments 18.6 40.3
Municipal securities    
Assets    
Available-for-sale investments 4.4 4.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 164.9 75.0
Investments held for deferred compensation plans 69.4 63.7
Derivatives 19.4 4.9
Assets 831.2 826.8
Liabilities    
Derivatives 15.3 24.8
Deferred compensation plans 69.7 64.1
Contingent consideration liabilities 199.0 244.3
Liabilities 284.0 333.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments 0.5 0.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 386.5 445.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 95.9 120.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 68.6 68.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Foreign government bonds    
Assets    
Available-for-sale investments 3.0 3.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper    
Assets    
Available-for-sale investments 18.6 40.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities    
Assets    
Available-for-sale investments 4.4 4.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 53.1 52.2
Investments held for deferred compensation plans 69.4 63.7
Derivatives 0.0 0.0
Assets 143.1 136.5
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 69.7 64.1
Contingent consideration liabilities 0.0
Liabilities 69.7 64.1
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 20.6 20.6
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 111.8 22.8
Investments held for deferred compensation plans 0.0 0.0
Derivatives 19.4 4.9
Assets 688.1 690.3
Liabilities    
Derivatives 15.3 24.8
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Liabilities 15.3 24.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments 0.5 0.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 386.5 445.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 95.9 120.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 48.0 48.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Foreign government bonds    
Assets    
Available-for-sale investments 3.0 3.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper    
Assets    
Available-for-sale investments 18.6 40.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities    
Assets    
Available-for-sale investments 4.4 4.4
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 199.0 244.3
Liabilities 199.0 244.3
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
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities    
Assets    
Available-for-sale investments $ 0.0 $ 0.0