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Fair Value Measurements (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Fair Value, Measurements, Recurring | Fair Value  
Assets:  
Deferred compensation plan assets $ 61.1
Net investment hedge asset 1.5
Total assets 62.6
Liabilities:  
Deferred compensation plan liabilities 76.9
Total liabilities 76.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring  
Assets:  
Deferred compensation plan assets 29.9
Total assets 29.9
Liabilities:  
Deferred compensation plan liabilities 76.9
Total liabilities 76.9
Significant Other Observable Inputs (Level 2)  
Liabilities:  
Cost basis of investment funds 54.8
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring  
Assets:  
Deferred compensation plan assets 31.2
Net investment hedge asset 1.5
Total assets $ 32.7