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Employee Benefit Plans - Fair Value Measurement of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Allocation 100.00% 100.00%  
Plan assets $ 209.3 $ 190.2 $ 174.9
Cash/Money Markets      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 2.00% 3.00%  
Plan assets $ 4.1 $ 4.5  
Foreign Government/Treasury Securities      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 10.00% 10.00%  
Plan assets $ 21.4 $ 19.4  
Corporate Bonds, Debentures      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 18.00% 19.00%  
Plan assets $ 36.9 $ 35.3  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 23.00% 21.00%  
Plan assets $ 48.5 $ 40.4  
Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 5.00% 4.00%  
Plan assets $ 9.5 $ 8.0  
Investment and Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Allocation 42.00% 43.00%  
Plan assets $ 88.9 $ 82.6  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 25.5 23.9  
Level 1 | Cash/Money Markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.1 4.5  
Level 1 | Foreign Government/Treasury Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 21.4 19.4  
Level 1 | Corporate Bonds, Debentures      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 1 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 1 | Investment and Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 126.3 114.3  
Level 2 | Cash/Money Markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 2 | Foreign Government/Treasury Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 2 | Corporate Bonds, Debentures      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 36.9 35.3  
Level 2 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 48.5 40.4  
Level 2 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 9.5 8.0  
Level 2 | Investment and Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 31.4 30.6  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 57.5 52.0  
Level 3 | Cash/Money Markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 3 | Foreign Government/Treasury Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 3 | Corporate Bonds, Debentures      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 3 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 3 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Level 3 | Investment and Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 57.5 $ 52.0 $ 50.6