Employee Benefit Plans (Narrative) (Details) $ in Millions |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2019
USD ($)
pension_plan
|
Mar. 31, 2018
USD ($)
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||
| Defined Contribution Plan, Cost | $ 4.1 | $ 3.8 |
| Number Of Company Sponsored Union Pension Plans | pension_plan | 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 | $ 32.1 | |
| 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 | $ 0.2 | |