Cost Reduction Plan - Summary of the CIP Reserve Activity (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Nov. 30, 2015	Dec. 31, 2016
Supplemental Unemployments Benefits [Roll Forward]
Beginning balance, Severance	$ 11.1	$ 0.0	$ 10.9
Severance accrual in period	(0.2)	12.9	0.0
Severance payments	0.0	(1.8)	(0.9)
Severance adjustments			(3.2)
Ending balance, Severance	10.9	11.1	6.8
Beginning balance, Retention	2.7	0.0	1.7
Retention accrual in period	0.2	2.7	2.3
Retention payments	(1.2)	0.0	(1.9)
Retention adjustments			0.0
Ending balance, Retention	1.7	2.7	2.1
Beginning balance, total	13.8	0.0	12.6
Total accrual in period	0.0	15.6	2.3
Total payments	(1.2)	(1.8)	(2.8)
Total adjustments			(3.2)
Ending balance, total	$ 12.6	$ 13.8	$ 8.9