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Employee Retirement Plans (Plan Assets and Investment Strategy) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 443.5 $ 469.0 $ 436.8
Debt securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Target allocation percentage of assets 75.00%    
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Actual plan asset allocations 74.00%    
Equity securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Target allocation percentage of assets 25.00%    
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Actual plan asset allocations 26.00%    
Redemption Notice Period | JP Morgan Chase Bank Strategic Property Fund      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 30 days    
Redemption Notice Period | Pyramis Long Corporate A or Better      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 15 days    
Redemption Notice Period | Pyramis Long Duration      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 15 days    
Redemption Notice Period | Russell 3000 Index NL      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 1 day    
Redemption Notice Period | Pyramis 810 Corporate      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 15 days    
Fair Value, Recurring | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 3.2 5.3  
Fair Value, Recurring | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 142.8 154.6  
Fair Value, Recurring | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | NAV      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 297.5 309.1  
Fair Value, Recurring | NAV | JP Morgan Chase Bank Strategic Property Fund      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 12.8 12.8  
Fair Value, Recurring | NAV | Pyramis Long Corporate A or Better      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 55.4 98.5  
Fair Value, Recurring | NAV | Pyramis Long Duration      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 46.9 98.8  
Fair Value, Recurring | NAV | Russell 3000 Index NL      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 81.1 99.0  
Fair Value, Recurring | NAV | Pyramis 810 Corporate      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 101.3 0.0  
Fair Value, Recurring | Cash and cash equivalents      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 3.2 5.3  
Fair Value, Recurring | Cash and cash equivalents | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 3.2 5.3  
Fair Value, Recurring | Cash and cash equivalents | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Cash and cash equivalents | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Debt securities      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 120.6 125.7  
Fair Value, Recurring | Debt securities | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Debt securities | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 120.6 125.7  
Fair Value, Recurring | Debt securities | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Equity securities      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 22.2 28.9  
Fair Value, Recurring | Equity securities | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Equity securities | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 22.2 28.9  
Fair Value, Recurring | Equity securities | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Fair Value, Recurring | Pension Plan Assets, Excluding Investments Measured At NAV      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 146.0 $ 159.9