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Employee Benefit Plans - Schedule of Plan Assets Using the Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 125.1 $ 161.3  
Net Asset Value ("NAV")      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 111.4 142.2  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.7 4.7  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12.0 14.4  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.7 4.7  
Cash | Net Asset Value ("NAV")      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.7 4.7  
Cash | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Cash | Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Insurance Group Annuity Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12.0 14.4 $ 14.5
Insurance Group Annuity Contracts | Net Asset Value ("NAV")      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Insurance Group Annuity Contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Insurance Group Annuity Contracts | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Insurance Group Annuity Contracts | Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12.0 14.4  
Common/Collective Trust Funds — Government, Corporate and Other Non-government Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 56.3 70.4  
Common/Collective Trust Funds — Government, Corporate and Other Non-government Debt | Net Asset Value ("NAV")      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 56.3 70.4  
Common/Collective Trust Funds — Government, Corporate and Other Non-government Debt | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/Collective Trust Funds — Government, Corporate and Other Non-government Debt | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/Collective Trust Funds — Government, Corporate and Other Non-government Debt | Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/Collective Trust Funds — Corporate Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 55.1 71.8  
Common/Collective Trust Funds — Corporate Equity | Net Asset Value ("NAV")      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 55.1 71.8  
Common/Collective Trust Funds — Corporate Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/Collective Trust Funds — Corporate Equity | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/Collective Trust Funds — Corporate Equity | Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0