Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Foreign currency translation adjustments:
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax	$ (13.9)	$ (4.1)		$ (3.9)	$ (1.6)
Long-term intercompany loans	3.0	(18.3)		(17.9)	(38.1)
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax	30.6	5.0		(18.6)	(43.2)
Total foreign currency translation adjustment, pretax	19.7	(17.4)		(40.4)	(82.9)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(4.9)	(1.5)		(1.2)	(0.6)
Total foreign currency translation adjustment, net of tax	24.6	(15.9)		(39.2)	(82.3)
Net change in minimum pension liability
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	1.1	0.8		3.2	2.2
Total pension, pretax	1.1	0.8		3.2	2.2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	0.3	0.2		0.9	0.6
Net change in minimum pension liability, net of tax	0.8	0.6		2.3	1.6
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0.8	0.0		25.3	0.0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	0.8	0.0		25.3	0.0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(0.2)	0.0		9.0	0.0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ 1.0	$ 0.0	$ 15.3	$ 16.3	$ 0.0