Revenue - Summary of Revenue by End-use Markets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 641.4	$ 609.9	$ 556.5	$ 572.4	$ 618.0	$ 572.2	$ 487.8	$ 479.8	$ 2,380.2	$ 2,157.7	$ 1,797.6
Aerospace and Defense
Disaggregation of Revenue [Line Items]
Net sales									1,327.9	1,182.3	973.3
Medical
Disaggregation of Revenue [Line Items]
Net sales									205.0	175.3	125.5
Energy
Disaggregation of Revenue [Line Items]
Net sales									181.7	146.5	138.0
Transportation
Disaggregation of Revenue [Line Items]
Net sales									157.7	157.0	143.9
Industrial and Consumer
Disaggregation of Revenue [Line Items]
Net sales									371.5	364.9	298.2
Distribution
Disaggregation of Revenue [Line Items]
Net sales									$ 136.4	$ 131.7	$ 118.7