Intangible Assets and Goodwill - Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Goodwill [Line Items]
Goodwill impairment	$ 35.4	$ 0	$ 35.4	$ 0
Goodwill	36.1		36.1		72.1
Storage Solutions
Goodwill [Line Items]
Goodwill impairment	35.4
Goodwill	$ 28.1		$ 28.1
Income Approach Valuation Technique | Storage Solutions
Goodwill [Line Items]
Fair value inputs, forecast period	10 years
Fair value inputs, discount rate	16.50%
Fair value inputs, terminal growth rate	3.00%
Goodwill impairment test, increase of discount rate potentially result in indication of impairment (less than 1.0 basis point)	2.00%
Fair value inputs, estimated market discount rate	14.50%