Stockholders' Equity Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (2.0)	$ (2.4)
Other comprehensive loss before reclassifications	(1.1)	(0.2)
Amounts reclassified from accumulated other comprehensive loss	(0.1)	0.6
Other comprehensive income (loss)	(1.2)	0.4	(0.2)
Balance	(3.2)	(2.0)	(2.4)
Postemployment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	0.3	0.4
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(0.2)	(0.1)
Other comprehensive income (loss)	(0.2)	(0.1)
Balance	0.1	0.3
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(2.2)	(2.2)
Other comprehensive loss before reclassifications	(1.1)	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income (loss)	(1.1)	0
Balance	(3.3)	(2.2)
Unrealized Loss on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(0.1)	(0.6)
Other comprehensive loss before reclassifications	0	(0.2)
Amounts reclassified from accumulated other comprehensive loss	0.1	0.7
Other comprehensive income (loss)	0.1	0.5
Balance	$ 0	$ (0.1)