Employee Benefit Plans (Change in Projected Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Fair value of plan assets at beginning of year	$ 31.3
Fair value of plan assets at end of year	32.5	$ 31.3
Reconciliation of amounts recognized in the consolidated balance sheets:
Accumulated other comprehensive loss	(10.8)	(7.5)
Pension Plans, Defined Benefit
Change in projected benefit obligation:
Benefit obligation at beginning of year	35.6	38.3
Service cost	0.0	0.1	$ 0.1
Interest cost	1.5	1.3	2.3
Benefit payments	(2.4)	(1.6)
Actuarial (gain) loss	5.5	(2.5)
Benefit obligation at end of year	40.2	35.6	38.3
Change in plan assets:
Fair value of plan assets at beginning of year	31.3	35.4
Benefit payments	(2.4)	(1.6)
Actual return on assets	3.6	(2.5)
Fair value of plan assets at end of year	32.5	31.3	$ 35.4
Reconciliation of amounts recognized in the consolidated balance sheets:
Accrued benefit obligation, long-term	(7.7)	(4.3)
Unrecognized net actuarial loss	10.8	7.5
Accumulated other comprehensive loss	10.8	7.5
Net amount recognized at end of year	$ 3.1	$ 3.2