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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 100.00%    
Plan assets at fair value $ 60.4 $ 71.2 $ 78.6
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 46.4 50.9  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 6.3 7.7  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 1.0 2.7  
Total plan assets measured at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 53.7 61.3  
Alternative investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 6.7 9.9  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 7.0 1.3  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 7.0 1.3  
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) 22.50%    
United States equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0.5 4.5  
United States equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.5 4.5  
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      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 9.3 17.2  
International equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 9.3 17.2  
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) 49.70%    
United States government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 6.4 3.3  
United States government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 6.4 3.3  
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      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 23.2 24.6  
International government bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 23.2 24.6  
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) 6.80%    
Plan assets at fair value $ 4.1 4.3  
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 4.1 4.3  
Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Mortgages      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 2.2 3.4  
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 2.2 3.4  
Mortgages | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0.0 0.0  
Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 1.0 2.7  
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 $ 1.0 $ 2.7 $ 58.5
Other      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocations (as a percent) 21.00%