Reclassifications from Accumulated Other Comprehensive (Loss) Income (AOCI) - Schedule of changes in AOCI by component, net of tax (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at the beginning of the period	$ 1,445.7	$ 1,520.1
Other comprehensive (loss) income before reclassifications	16.2	25.2
Amounts reclassified from AOCI	1.4	(1.0)
Other comprehensive income, net of tax	17.6	24.2
Balances at the end of the period	1,407.5	1,577.0
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at the beginning of the period	(398.0)	(351.8)
Balances at the end of the period	(380.4)	(327.6)
Cash flow hedging items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at the beginning of the period	(11.1)	(14.8)
Other comprehensive (loss) income before reclassifications	10.5	30.7
Amounts reclassified from AOCI	(2.2)	(4.0)
Other comprehensive income, net of tax	8.3	26.7
Balances at the end of the period	(2.8)	11.9
Pension and other postretirement benefit plan items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at the beginning of the period	(334.3)	(293.3)
Other comprehensive (loss) income before reclassifications	0.0	0.0
Amounts reclassified from AOCI	3.6	3.0
Other comprehensive income, net of tax	3.6	3.0
Balances at the end of the period	(330.7)	(290.3)
Foreign currency items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at the beginning of the period	(52.6)	(43.7)
Other comprehensive (loss) income before reclassifications	5.7	(5.5)
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive income, net of tax	5.7	(5.5)
Balances at the end of the period	$ (46.9)	$ (49.2)