Employee Benefit Plans (Schedule of Change in Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	$ 39.4	$ 43.4
Service cost	6.0	6.3	$ 7.8
Curtailment	0.0	3.8
Other	9.6	(6.5)
Projected benefit obligation, end of year	55.0	39.4	$ 43.4
Accumulated benefit obligation, end of year	$ 49.9	$ 36.1