XML 88 R75.htm IDEA: XBRL DOCUMENT v3.22.0.1
Multiemployer Pension Plans - Multiemployer Pension Plan Description and Contributions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Multiemployer Pension Plan Disclosure [Line Items]      
Entity Tax Identification Number 94-3030279    
Contributions of the Company $ 5.0 $ 4.9 $ 5.0
USW Plan      
Multiemployer Pension Plan Disclosure [Line Items]      
Entity Tax Identification Number 23-6648508    
Pension Protection Act Zone Status Green Green  
FIP/RP Status Pending/Implemented in 2021 No    
Contributions of the Company $ 3.6 $ 3.8 3.8
Surcharge Imposed in 2021   No  
USW Plan | Minimum      
Multiemployer Pension Plan Disclosure [Line Items]      
Expiration Date of Collective-Bargaining Agreement Sep. 30, 2025    
USW Plan | Maximum      
Multiemployer Pension Plan Disclosure [Line Items]      
Expiration Date of Collective-Bargaining Agreement Nov. 30, 2026    
Other Funds      
Multiemployer Pension Plan Disclosure [Line Items]      
Contributions of the Company $ 1.4 $ 1.1 $ 1.2