Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan Assets
Net actuarial loss	$ 56.5	$ 65.2
Expense provision for 401 (k) plans	4.4	4.3	$ 4.1
Company Contributions	43.6	44.3	$ 35.7
Hedge fund investments
Pension Plan Assets
Investments in hedge funds which do not have readily determinable fair values	$ 12.8	$ 10.6
Employee Pension Plans
Pension Plan Assets
Discount rate (as a percent)	2.70%	2.20%
Expected return on assets (as a percent)	5.75%	5.75%	5.75%