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Retirement Benefits (Details 17) - Pension Benefits [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Multiemployer Plan Disclosure [Line Items]      
Company Contributions $ 5.6 $ 5.4 $ 4.5
Steelworkers Western Independent Shops Pension Plan [Member]      
Multiemployer Plan Disclosure [Line Items]      
Pension Plan Number 001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented [1] NA    
Company Contributions $ 0.9 $ 0.8 0.6
Surcharge Imposed No    
Expiration Dates of Collective Bargaining Agreements Feb. 29, 2020    
Boilermakers-Blacksmiths National Pension Trust [Member]      
Multiemployer Plan Disclosure [Line Items]      
Pension Plan Number 001    
Pension Protection Act Zone Status Red Yellow  
FIP / RP Status Pending / Implemented [1] Implemented    
Company Contributions $ 2.5 $ 2.5 2.2
Surcharge Imposed No    
Expiration Dates of Collective Bargaining Agreements Sep. 30, 2026    
IAM National Pension Fund [Member]      
Multiemployer Plan Disclosure [Line Items]      
Pension Plan Number 002    
Pension Protection Act Zone Status Red Green  
FIP / RP Status Pending / Implemented [1] Implemented    
Company Contributions $ 2.2 $ 2.1 $ 1.7
Surcharge Imposed Yes    
Expiration Dates of Collective Bargaining Agreements, First Date [2] Nov. 14, 2021    
Expiration Dates of Collective-Bargaining Agreements, Last Date [2] Jul. 14, 2022    
[1]
The “FIP / RP Status Pending / Implemented” column indicates whether a Funding Improvement Plan, as required under the Code by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” zone, is pending or has been implemented as of the end of the plan year that ended in 2019.
[2]
The Company is party to five separate bargaining agreements that require contributions to this plan. Expiration dates of these collective bargaining agreements range between November 14, 2021 and July 14, 2022.