Unusual Items - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Feb. 28, 2015
Unusual or Infrequent Item [Line Items]
Realized gains (losses) and interest	$ 0.4	$ (0.1)	$ (0.7)
Loss on debt repurchased	$ 0.0	0.3	0.2
Delayed Draw Term Loan [Member]
Unusual or Infrequent Item [Line Items]
Retired principal amount		13.0	8.0
Loss on debt repurchased		$ 0.3	$ 0.2