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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 |  |  |

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