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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets:    
U.S. Treasury securities $ 21.3 $ 9.1
Deferred compensation plan assets 27.4 28.0
Total assets 48.7 37.1
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Deferred compensation plan liabilities 27.4 28.0
Debt 1,593.6 1,299.3
Total liabilities 1,674.3 1,397.8
Level 1    
Assets:    
U.S. Treasury securities 21.3 9.1
Deferred compensation plan assets 27.4 28.0
Total assets 48.7 37.1
Liabilities:    
Deferred compensation plan liabilities 27.4 28.0
Total liabilities 27.4 28.0
Level 2    
Liabilities:    
Debt 1,593.6 1,299.3
Total liabilities 1,593.6 1,299.3
Level 3    
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Total liabilities $ 53.3 $ 70.5