Intangible Assets and Goodwill - Intangible Assets (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
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 141.3		$ 141.3		$ 139.5
Accumulated amortization	(80.1)		(80.1)		(70.9)
Intangible assets, net	61.2		61.2		68.6
Amortization expense	3.2	3.4	9.6	10.3
Finite-Lived Intangible Assets, Amortization Expense, Remainder of 2014	3.0		3.0
Finite-Lived Intangible Assets, Amortization Expense, 2015	11.9		11.9
Finite-Lived Intangible Assets, Amortization Expense, 2016	8.5		8.5
Finite-Lived Intangible Assets, Amortization Expense, 2017	7.7		7.7
Finite-Lived Intangible Assets, Amortization Expense, 2018	6.3		6.3
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	35.6		35.6		34.3
Accumulated amortization	(12.8)		(12.8)		(9.2)
Intangible assets, net	22.8		22.8		25.1
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	59.3		59.3		58.5
Accumulated amortization	(55.1)		(55.1)		(53.3)
Intangible assets, net	4.2		4.2		5.2
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	20.2		20.2		20.4
Accumulated amortization	(3.4)		(3.4)		(2.1)
Intangible assets, net	16.8		16.8		18.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26.2		26.2		26.3
Accumulated amortization	(8.8)		(8.8)		(6.3)
Intangible assets, net	17.4		17.4		20.0
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	14.0		14.0
Storage Solutions
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 31.6		$ 31.6