Revenue - Summary of Revenue by End-use Markets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 556.5	$ 487.8	$ 1,128.9	$ 967.5
Aerospace and defense
Disaggregation of Revenue [Line Items]
Consolidated net sales	299.0	264.9	609.7	523.5
Energy
Disaggregation of Revenue [Line Items]
Consolidated net sales	42.8	31.8	87.1	63.8
Transportation
Disaggregation of Revenue [Line Items]
Consolidated net sales	37.8	35.8	78.1	72.5
Medical
Disaggregation of Revenue [Line Items]
Consolidated net sales	45.5	42.8	92.5	81.0
Industrial and consumer
Disaggregation of Revenue [Line Items]
Consolidated net sales	97.5	83.1	193.6	167.5
Distribution
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 33.9	$ 29.4	$ 67.9	$ 59.2