Pension Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Deferred compensation arrangement, by type of deferred compensation [Line Items]
Net periodic benefit cost expected In next fiscal year	$ 3.3
Benefits paid	0.2	$ 0.2
Expected future employer contributions, current fiscal year	$ 1.3
Minimum
Deferred compensation arrangement, by type of deferred compensation [Line Items]
Termination benefits, salary period	1 month
Maximum
Deferred compensation arrangement, by type of deferred compensation [Line Items]
Termination benefits, salary period	5 months