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Pension and Postretirement Plans - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, cost $ 11.3 $ 8.2 $ 8.4
Capitalized portion of defined benefit contribution percent   13.00% 13.00%
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlements 3.6 $ 11.0  
Settlements (3.6) (11.3)  
Pension settlement charges 0.1 4.0 $ 0.0
Transfer of special death benefit 0.0 (14.0)  
Pension Plan | Qualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Payment for Pension and Other Postretirement Benefits 9.3 2.3 3.1
Expected future employer contributions, next fiscal year 3.0    
Pension Plan | Nonqualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Payment for Pension and Other Postretirement Benefits 2.3 2.3 2.3
Expected future employer contributions, next fiscal year 3.0    
Other Postretirement Benefits Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlements 0.0 0.0  
Settlements 0.0 0.0  
Pension settlement charges 0.0 0.0 $ 0.0
Transfer of special death benefit 0.0 (14.0)  
Expected future employer contributions, next fiscal year $ 11.0    
Cincinnati Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Allocation percentage in united states based investments 52.00%    
Cincinnati Plans [Member] | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, plan assets percentage 65.00%    
Cincinnati Plans [Member] | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, plan assets percentage 35.00%    
Cincinnati Plans [Member] | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlements   11.0  
Settlements   11.3  
Pension settlement charges   4.0  
Transfer of special death benefit   $ 14.0  
Hawaii Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Allocation percentage in united states based investments 69.00%    
Hawaii Plans [Member] | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, plan assets percentage 60.00%    
Hawaii Plans [Member] | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, plan assets percentage 40.00%    
Hawaii Plans [Member] | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlements $ 3.6    
Settlements 3.6    
Pension settlement charges 0.1    
Hawaii Plans [Member] | Pension Plan | Qualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Payment for Pension and Other Postretirement Benefits $ 5.0