Equity and Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Earnings/(Loss) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income /(loss), net of tax		$ (8.4)	$ (131.7)	$ (149.8)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(13.0)	9.1	6.4
Accumulated Other Comprehensive Income (Loss), Net of Tax		(314.1)	(305.7)	(174.0)	$ (24.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(31.9)	(118.8)	(144.0)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ 15.3	10.5	0.0	0.0
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(280.7)	(248.8)	(130.0)	14.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax			(118.8)	(144.0)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		10.5	0.0		0.0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax			0.0
Accumulated Deferred Compensation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income /(loss), net of tax		0.0	(3.8)	0.6
Accumulated Other Comprehensive Income (Loss), Net of Tax		0.0	0.0	3.8	3.2
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax			9.1	6.4
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (43.9)	$ (56.9)	$ (47.8)	$ (41.4)