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Business Combination and Integration (Acquisition-related and integration-related charges incurred during the period) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquisition-related charges	$ 0	$ 0	$ 5.7
Integration-related charges	8.2	29.4	144.3
Total transaction and integration charges	8.2	29.4	150.0
Staff costs [Member]
Integration-related charges	0.1	2.8	39.1
Technology, contractor and related costs [Member]
Integration-related charges	0.6	11.0	53.4
Professional services [Member]
Integration-related charges	$ 7.5	$ 15.6	$ 51.8

The charge against earnings in the period, comprised of costs incurred associated with an exit or disposal activity other than for a discontinued operations as defined under generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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