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Pension and Other Retiree Benefits Pension and Other Retiree Benefits (Multi-Employer) (Details) - Multi-employer Plans, Pension - PACE Industry Union-Management Pension Fund - Multiemployer Plan, Plan Information, Available - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Multiemployer Plans [Line Items]      
Minimum Period in Years for Withdrawal Liability 20 years    
EIN 116166763    
Pension Plan Number 001    
Pension Protection Act Zone Status Red Red  
Multiemployer Plans, Certified Zone Status, Date Dec. 31, 2016 Dec. 31, 2015  
FIP/RP Status Implemented    
Contributions $ 0.2 $ 0.3 $ 0.3
Surcharge Imposed Yes    
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date Jun. 30, 2018