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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions and Dispositions - 2012 Acquisitions (Details) In Millions, unless otherwise specified				1 Months Ended			1 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jul. 31, 2012 Parspro USD ($)	Jun. 30, 2012 Provoloto USD ($)	Jun. 30, 2013 Provoloto	Jun. 30, 2012 ADS GBP (£)
Business Acquisition [Line Items]
Consideration transferred				$ 11.8	$ 9.7		£ 3.5
Consideration transferred, liabilities incurred					2.0
Percentage of voting interests acquired						100.00%
Goodwill	$ 4,108.3us-gaap_Goodwill	$ 1,183.1us-gaap_Goodwill	$ 801.4us-gaap_Goodwill	$ 9.9	$ 5.1		£ 2.2