Revenue - Summary of Revenue by End-use Markets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 437.3	$ 585.4	$ 573.0	$ 585.4	$ 641.4	$ 609.9	$ 556.5	$ 572.4	$ 2,181.1	$ 2,380.2	$ 2,157.7
Aerospace and Defense
Disaggregation of Revenue [Line Items]
Net sales									1,313.7	1,327.9	1,182.3
Medical
Disaggregation of Revenue [Line Items]
Net sales									197.0	205.0	175.3
Transportation
Disaggregation of Revenue [Line Items]
Net sales									132.1	157.7	157.0
Energy
Disaggregation of Revenue [Line Items]
Net sales									135.4	181.7	146.5
Industrial and Consumer
Disaggregation of Revenue [Line Items]
Net sales									296.0	371.5	364.9
Distribution
Disaggregation of Revenue [Line Items]
Net sales									$ 106.9	$ 136.4	$ 131.7