Revenue - Summary of Revenue by Geography (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
United States
Disaggregation of Revenue [Line Items]
Net sales									1,393.4	1,606.7	1,429.4
Europe
Disaggregation of Revenue [Line Items]
Net sales									387.4	387.2	383.0
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales									237.5	196.3	174.8
Mexico
Disaggregation of Revenue [Line Items]
Net sales									67.0	81.6	61.7
Canada
Disaggregation of Revenue [Line Items]
Net sales									54.2	67.8	65.7
Other
Disaggregation of Revenue [Line Items]
Net sales									$ 41.6	$ 40.6	$ 43.1