Derivatives and Hedging Activities - Summary of effect of derivative instruments on income (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net sales	$ 585.4	$ 572.4
Cost of sales	472.8	480.7
Interest expense	5.4	6.3
Amount of gain reclassified from AOCI to income	5.3	(1.7)
Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	0.4	0.2
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	4.8	(2.0)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	0.1	0.1
Commodity contracts | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Commodity contracts | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	4.8	(2.0)
Commodity contracts | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Foreign currency forward contracts | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.4	0.2
Foreign currency forward contracts | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Foreign currency forward contracts | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Interest Rate Swaps | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Hedged Item	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0
Interest Rate Swaps | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.0	0.0
Hedged Item	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0
Interest Rate Swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to income	0.1	0.1
Hedged Item	0.0	0.3
Derivatives designated as hedging instruments	$ 0.0	$ (0.3)