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Pension and Postretirement Plans - Expected Future Benefit Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract]      
2019 $ (0.4)    
2020 (0.4)    
2021 (0.3)    
2022 (0.3)    
2023 (0.3)    
Years 2024 - 2028 1.0    
Pension Plan      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 77.3    
2020 51.3    
2021 50.1    
2022 47.9    
2023 46.3    
Years 2024 - 2028 196.5    
Other Postretirement Benefits Plan      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 11.5    
2020 10.7    
2021 10.4    
2022 10.0    
2023 9.5    
Years 2024 - 2028 41.8    
Qualified Plan | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits 9.3 $ 2.3 $ 3.1
Qualified Plan | Hawaii Plans [Member] | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits $ 5.0