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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets:    
U.S. Treasury securities $ 9.1 $ 67.9
Deferred compensation plan assets 28.0 24.5
Total assets 37.1 92.4
Liabilities:    
Contingent consideration liabilities 70.5 32.7
Deferred compensation plan liabilities 28.0 24.5
Debt 1,299.3 1,319.1
Total liabilities 1,397.8 1,376.3
Level 1    
Assets:    
U.S. Treasury securities 9.1 67.9
Deferred compensation plan assets 28.0 24.5
Total assets 37.1 92.4
Liabilities:    
Deferred compensation plan liabilities 28.0 24.5
Total liabilities 28.0 24.5
Level 2    
Liabilities:    
Debt 1,299.3 1,319.1
Total liabilities 1,299.3 1,319.1
Level 3    
Liabilities:    
Contingent consideration liabilities 70.5 32.7
Total liabilities $ 70.5 $ 32.7