Equity and Accumulated Other Comprehensive Income (Loss) - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (350.6)		$ (353.9)
Other comprehensive income/(loss) before reclassifications	(43.1)		(42.8)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.1		3.1
Total foreign currency translation adjustment, net of tax	(43.1)	$ 21.5	(42.8)	$ (4.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	0.1	0.4	3.1	1.4
Other comprehensive income/(loss), net of tax	(43.0)	$ 21.9	(39.7)	$ (3.5)
Ending Balance	(393.6)		(393.6)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(303.4)		(303.7)
Other comprehensive income/(loss) before reclassifications	(43.1)		(42.8)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0		0.0
Total foreign currency translation adjustment, net of tax	(43.1)		(42.8)
Ending Balance	(346.5)		(346.5)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(46.1)		(49.1)
Other comprehensive income/(loss) before reclassifications	0.0		0.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.1		3.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.1)		(3.1)
Ending Balance	(46.0)		(46.0)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1.1)		(1.1)
Other comprehensive income/(loss) before reclassifications	0.0		0.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0		0.0
Available for sale investments	0.0		0.0
Ending Balance	$ (1.1)		$ (1.1)