Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies
Total rental expense under operating leases	$ 24.6	$ 21.6	$ 18.5
Future minimum lease payments under non-cancelable operating leases
2014	20.7
2015	17.0
2016	13.2
2017	10.4
2018	8.7
Thereafter	17.7
Total	87.7
Capital Leases
Cost of the buildings under the capital leases	8.8	9.9
Accumulated amortization of the leased buildings	2.8	3.0
License Agreements
Income from cross-licensing agreements	9.5	20.2	2.9
Licensing fees	$ 4.0	$ 4.2	$ 2.8

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Property, plant, or equipment held under lease agreements classified as an asset.

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

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