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Subsequent Events Subsequent Events (Details)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 08, 2019
USD ($)
beneficiary
participant
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Subsequent Event          
Subsequent Event [Line Items]          
Subsequent Event, Date Oct. 08, 2019        
Pension plans          
Subsequent Event [Line Items]          
Settlement charge   $ (0.6) $ (0.4) $ (1.5) $ (1.4)
U.S. Plans | Pension plans          
Subsequent Event [Line Items]          
Settlement charge   $ 0.0 $ 0.0 $ 0.0 $ 0.0
U.S. Plans | Pension plans | Subsequent Event          
Subsequent Event [Line Items]          
Annuity Buy Out Number of Participants | participant 2,634        
Plan asset payment for settlement $ 53.0        
Primary U.S. Pension Plan Obligation Settled 54.0        
Settlement charge $ 20.0        
Pension Plan Beneficiaries | beneficiary 11,400