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Related Parties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Certain shareholders
Related parties
Expenses incurred	$ 2.0	$ 2.6	$ 2.4
Law firm
Related parties
Expenses incurred	2.4	5.3	2.4
Financial services firm
Related parties
Expenses incurred	0.1	0.2	0.4
Life science supply company
Related parties
Revenue	0.9	0.1
Life sciences company
Related parties
Revenue	1.9
Expenses incurred	$ 0.1

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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