Employee Benefit Plans (Schedule of Change in Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in plan assets:
Fair value of plan assets, beginning of year	$ 21.8	$ 24.2
Employer contributions	3.4	3.0
Plan participants' contributions	1.4	1.3
Curtailment	0.0	(2.4)
Other	0.7	(4.3)
Fair value of plan assets, end of year	27.3	21.8
Funded status at end of year	$ (27.7)	$ (17.6)