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Benefit Plans (Allocation of Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 214.5 $ 239.5
Weighted average asset allocations 100.00% 100.00%
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   $ 0.0
Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1.7 1.6
Cash [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1.7 $ 1.6
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 23.00% 63.00%
Target allocation 30.00% 65.00%
International Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 17.7 $ 15.5
International Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17.7 $ 15.5
International Mutual Funds [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0  
International Mutual Funds [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0.0  
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 74.00% 37.00%
Target allocation 70.00% 35.00%
Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 3.00% 0.00%
Target allocation 0.00%  
Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 13.9 $ 17.5
Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13.9 17.5
Mutual Funds [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0  
Mutual Funds [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0  
Pension Plan Assets In The Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 33.3 34.6
Pension Plan Assets In The Fair Value Hierarchy [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 33.3 34.6
Pension Plan Assets In The Fair Value Hierarchy [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.0  
Pension plan assets measured at NAV [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 181.2 $ 204.9
Minimum [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description .27  
Minimum [Member] | Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description .67  
Minimum [Member] | Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description 0  
Maximum [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description .33  
Maximum [Member] | Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description .73  
Maximum [Member] | Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description .03