Employee Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Accumulated benefit obligation	$ 215.1	$ 219.2
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	219.2	218.0
Interest cost	4.7	6.4	$ 8.9
Actuarial loss	6.7	11.3
Benefits paid	(15.5)	(16.5)
Projected benefit obligation at end of year	215.1	219.2	218.0
Change in plan assets:
Fair value of plan assets at beginning of year	232.5	226.6
Actual return on plan assets	6.3	24.5
Estimated expenses	(1.5)	(2.1)
Benefits paid	(15.5)	(16.5)
Fair value of plan assets at end of year	221.8	232.5	$ 226.6
Over funded status	6.7	13.3
Amounts recognized in the statement of financial position consist of:
Noncurrent assets	6.7	13.3
Net amount recognized	$ 6.7	$ 13.3
Weighted average assumptions used to determine benefit obligations:
Discount rate	2.77%	2.24%