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Pension Benefits (Details)
$ in Millions
 12 Months Ended
Jul. 13, 2018
USD ($)
Aug. 12, 2016
USD ($)
Dec. 31, 2018
USD ($)
employees
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Unrecognized Postretirement Benefit Costs Arising During the Year     $ (8.0) $ 3.9 $ 14.2
Defined Contribution Plan, Cost     $ 15.1 10.6 8.4
Pension Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Pension Plan, Number of Participants and Beneficiaries | employees     9,000    
Defined Benefit Pension Plans Active Employees | employees     1,400    
Percentage of Compensation, Defined Benefit Plan Employee Contribution     3.00%    
Amortization Period, Accumulated Unrecognized Pension Gain/Loss     23 years    
Employer Contributions     $ 5.1 0.0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment     0.0 0.0 0.3
Defined Benefit Plan, Funded (Unfunded) Status of Plan     (55.2) (57.4)  
Pension Expense Recognized     (4.3) (7.7) (1.5)
Unrecognized Postretirement Benefit Costs Arising During the Year     (11.5) 4.9 0.7
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan     24.2 26.3  
Pension Expense Recognized     0.8 0.8 (1.0)
Unrecognized Postretirement Benefit Costs Arising During the Year     $ 1.3 $ (1.6) $ 4.8
Cash [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer Contributions $ 5.1 $ 9.0