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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges	$ 0.0	$ 17.6	$ 0.0	$ 18.0
Asset impairment charges		7.6
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairment charges		$ 9.4