Cost Reduction Plan - Summary of the CIP Reserve Activity (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Nov. 30, 2015
Supplemental Unemployments Benefits [Roll Forward]
Beginning balance, Severance	$ 11.1	$ 10.9	$ 0.0
Severance accrual in period	(0.2)	(0.1)	12.9
Severance payments	0.0	(0.5)	(1.8)
Ending balance, Severance	10.9	10.3	11.1
Beginning balance, Retention	2.7	1.7	0.0
Retention accrual in period	0.2	0.6	2.7
Retention payments	(1.2)	(0.1)	0.0
Ending balance, Retention	1.7	2.2	2.7
Beginning balance, total	13.8	12.6	0.0
Total accrual in period	0.0	0.5	15.6
Total payments	(1.2)	(0.6)	(1.8)
Ending balance, total	$ 12.6	$ 12.5	$ 13.8