Earnings Per Share - TSR Performance Percentile (Details)	3 Months Ended
	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
2015 Award | Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR performance percentage relative to peer group, maximum	75.00%
Total shareholder return, absolute basis, maximum	75.00%
2016 Award | Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR performance percentage relative to peer group, maximum	75.00%
Total shareholder return, absolute basis	30.00%