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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets    
Fair Value $ 706.2 $ 683.2
Fair Value on a Recurring Basis | Fair Value    
Assets    
Cash equivalents 11.8 75.0
Investments held for deferred compensation plans 67.6 63.7
Derivatives 29.9 4.9
Total assets 815.5 826.8
Liabilities    
Derivatives 5.2 24.8
Deferred compensation plans 68.5 64.1
Contingent consideration liabilities 178.6 244.3
Total liabilities 252.3 333.2
Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Cash equivalents 0.0 52.2
Investments held for deferred compensation plans 67.6 63.7
Derivatives 0.0 0.0
Total assets 87.2 136.5
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 68.5 64.1
Contingent consideration liabilities
Total liabilities 68.5 64.1
Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Cash equivalents 11.8 22.8
Investments held for deferred compensation plans 0.0 0.0
Derivatives 29.9 4.9
Total assets 728.3 690.3
Liabilities    
Derivatives 5.2 24.8
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Total liabilities 5.2 24.8
Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Cash equivalents 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 0.0 0.0
Total assets 0.0 0.0
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 178.6 244.3
Total liabilities 178.6 244.3
Bank time deposits    
Assets    
Fair Value 0.0 0.5
Bank time deposits | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value   0.5
Bank time deposits | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value   0.0
Bank time deposits | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value   0.5
Bank time deposits | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value   0.0
Corporate debt securities    
Assets    
Fair Value 455.6 445.5
Corporate debt securities | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 455.6 445.5
Corporate debt securities | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 0.0 0.0
Corporate debt securities | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 455.6 445.5
Corporate debt securities | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value 0.0 0.0
Asset-backed securities    
Assets    
Fair Value 110.2 120.8
Asset-backed securities | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 110.2 120.8
Asset-backed securities | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 0.0 0.0
Asset-backed securities | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 110.2 120.8
Asset-backed securities | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value 0.0 0.0
U.S. government and agency securities    
Assets    
Fair Value 79.2 68.7
U.S. government and agency securities | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 79.2 68.7
U.S. government and agency securities | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 19.6 20.6
U.S. government and agency securities | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 59.6 48.1
U.S. government and agency securities | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value 0.0 0.0
International government bonds    
Assets    
Fair Value 1.7 3.0
International government bonds | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 1.7 3.0
International government bonds | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 0.0 0.0
International government bonds | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 1.7 3.0
International government bonds | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value 0.0 0.0
Commercial paper    
Assets    
Fair Value 56.7 40.3
Commercial paper | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 56.7 40.3
Commercial paper | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 0.0 0.0
Commercial paper | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 56.7 40.3
Commercial paper | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value 0.0 0.0
Municipal securities    
Assets    
Fair Value 2.8 4.4
Municipal securities | Fair Value on a Recurring Basis | Fair Value    
Assets    
Fair Value 2.8 4.4
Municipal securities | Fair Value on a Recurring Basis | Fair Value | Level 1    
Assets    
Fair Value 0.0 0.0
Municipal securities | Fair Value on a Recurring Basis | Fair Value | Level 2    
Assets    
Fair Value 2.8 4.4
Municipal securities | Fair Value on a Recurring Basis | Fair Value | Level 3    
Assets    
Fair Value $ 0.0 $ 0.0