Intangible Assets and Goodwill - Intangible Assets Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments	$ 0	$ 251.8	$ 0
Intangible asset abandonment	0	1.9	0
Definite-lived intangible assets	66.9
Indefinite-lived intangible assets not subject to amortization	1.7
Memorex Asset Group [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		155.5
Definite-lived intangible assets		164.1
Finite-lived Intangible Assets, Fair Value Disclosure		8.6
TDK Asset Group [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		90.4
Definite-lived intangible assets		96.7
Finite-lived Intangible Assets, Fair Value Disclosure		6.3
Memcorp Asset Group [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		8.7
Definite-lived intangible assets		8.7
Finite-lived Intangible Assets, Fair Value Disclosure		0
Imation Asset Group [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		5.9
Definite-lived intangible assets		5.9
Finite-lived Intangible Assets, Fair Value Disclosure		0
Consolidated Entities [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		260.5
Continuing Operations [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible impairments		$ 251.8