Unusual Items - Summary of Unusual Items Expense (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Feb. 28, 2015
Unusual items
Legal related matters	$ 0.4	$ (0.1)	$ (0.7)
Loss on debt repurchased	0.0	0.3	0.2
Total unusual items	$ 0.4	$ 0.2	$ (0.5)