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Employee Retirement Plans (Plan Assets and Investment Strategy) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 393.8 $ 454.8 $ 446.4
Investments measured at net asset value 250.8 293.8  
JP Morgan Chase Bank Strategic Property Fund      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Investments measured at net asset value 18.0 23.3  
Pyramis Long Corporate A or Better      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Investments measured at net asset value 78.6 73.9  
Pyramis Long Duration      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Investments measured at net asset value 79.2 73.5  
Russell 3000 Index NL      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Investments measured at net asset value 75.0 123.1  
Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 2.7 2.6  
Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 140.3 158.4  
Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Cash and cash equivalents      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 2.7 2.6  
Cash and cash equivalents | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 2.7 2.6  
Cash and cash equivalents | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Cash and cash equivalents | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 0.0 $ 0.0  
Debt securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation percentage of assets 70.00%    
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Actual plan asset allocations 70.00% 59.00%  
Fair value of plan assets $ 113.9 $ 118.4  
Debt securities | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Debt securities | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 113.9 118.4  
Debt securities | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets $ 0.0 $ 0.0  
Equity securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation percentage of assets 30.00%    
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Actual plan asset allocations 30.00% 41.00%  
Fair value of plan assets $ 26.4 $ 40.0  
Equity securities | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Equity securities | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 26.4 40.0  
Equity securities | Level 3      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 0.0 0.0  
Pension Plan Assets, Excluding Investments Measured At NAV      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Fair value of plan assets 143.0 161.0  
Investments measured at net asset value (“NAV”) (1)      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Investments measured at net asset value $ 250.8 $ 293.8  
Redemption Notice Period | JP Morgan Chase Bank Strategic Property Fund      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 30 days 45 days  
Redemption Notice Period | Pyramis Long Corporate A or Better      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 15 days 15 days  
Redemption Notice Period | Pyramis Long Duration      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 15 days 15 days  
Redemption Notice Period | Russell 3000 Index NL      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period 1 day 1 day  
Redemption Notice Period | Russell 1000 Index NL      
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]      
Redemption notice period   1 day