Employee Benefit Plans (Narrative) (Details) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2019
USD ($)
pension_plan
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2019
USD ($)
pension_plan
|
Sep. 30, 2018
USD ($)
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Defined Contribution Plan, Cost | $ 2.8 | $ 2.7 | $ 9.3 | $ 8.8 |
| Number Of Company Sponsored Union Pension Plans | pension_plan | 2 | 2 | ||
| Pension Plan [Member] | ||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 31.6 | $ 31.6 | ||
| Other Postretirement Benefits Plan [Member] | ||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 0.8 | $ 0.8 | ||