Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unrecognized net actuarial losses exceed higher of market value of plan assets or the projected benefit obligation at the beginning of the year	10.00%
Accumulated benefit obligation	$ 1,860.0	$ 2,040.0
Defined benefit plan, ultimate health care cost trend rate	5.70%
Defined benefit plan, ultimate health care cost trend rate, projected	4.50%
Total employer contributions	$ 107.4	115.5	$ 95.6
Multiemployer plans, withdrawal obligation	$ 5.5	$ 8.9		$ 27.3
Fiscal Year 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, ultimate health care cost trend rate	6.30%
Defined benefit plan, ultimate health care cost trend rate, projected	4.00%
Deferred Base Salary
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, maximum annual contribution per employee, percent	50.00%
Deferred Bonus
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, maximum annual contribution per employee, percent	100.00%