Acquisitions - Business Acquisition Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Revenue	$ 6,833.1	$ 6,725.8
Operating income (loss)	83.0	39.1
Net loss attributable to common shareholders	$ (169.3)	$ (139.6)
Loss per common share
Basic (in dollars per share)	$ (1.57)	$ (1.68)
Diluted (in dollars per share)	$ (1.57)	$ (1.68)

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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