Derivatives and Hedging Activities - Summary of Effect of Derivative Instruments on Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net sales	$ 556.5	$ 487.8	$ 1,128.9	$ 967.5
Cost of sales	449.5	402.1	930.2	796.2
Interest expense	7.0	7.3	13.2	14.5
Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	0.3	(0.1)	0.6	(0.5)
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	0.2	(0.2)	(1.8)	(2.8)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	0.1	0.1	0.2	0.2
Interest Rate Swaps | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Item	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0	0.0	0.0
Interest Rate Swaps | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Item	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0	0.0	0.0
Interest Rate Swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Item	0.1	(0.2)	0.3	(0.4)
Derivatives designated as hedging instruments	(0.1)	0.2	(0.3)	0.4
Amount Reclassified from AOCI | Accumulated Gain (Loss), Net Cash Flow Hedge, Parent | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net sales	0.0	0.0	0.0	0.0
Cost of sales	0.2	(0.2)	(1.8)	(2.8)
Interest expense	0.0	0.0	0.0	0.0
Amount Reclassified from AOCI | Accumulated Gain (Loss), Net Cash Flow Hedge, Parent | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net sales	0.3	(0.1)	0.6	(0.5)
Cost of sales	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Amount Reclassified from AOCI | Accumulated Gain (Loss), Net Cash Flow Hedge, Parent | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net sales	0.0	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0	0.0
Interest expense	$ 0.1	$ 0.1	$ 0.2	$ 0.2