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EMPLOYEE BENEFIT PLANS - Schedule of Target Weighted-Average Asset Allocations and Fair Value (Details) - Defined benefit pension plans - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 100.00%    
Plan assets at fair value $ 63.2 $ 60.4 $ 71.2
Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 56.1 53.7  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 48.5 46.4  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 6.7 6.3  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.9 1.0  
Alternative investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 7.1 6.7  
Cash | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3.8 7.0  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3.8 7.0  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Cash | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0.0 0.0  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 22.30%    
United States equities | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 3.0 0.5  
United States equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3.0 0.5  
United States equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
United States equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
International equities | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 11.2 9.3  
International equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 11.2 9.3  
International equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
International equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0.0 0.0  
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 48.30%    
United States government bonds | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 8.2 6.4  
United States government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 8.2 6.4  
United States government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
United States government bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
International government bonds | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 22.3 23.2  
International government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 22.3 23.2  
International government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
International government bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0.0 0.0  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 6.90%    
Real estate | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 4.4 4.1  
Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 4.4 4.1  
Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Mortgages | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 2.3 2.2  
Mortgages | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Mortgages | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 2.3 2.2  
Mortgages | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Insurance contracts | Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.9 1.0  
Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0.9 $ 1.0 $ 2.7
Other      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 22.50%