Business Acquisitions Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 126.8	$ 90.9
Goodwill recognized through acquisitions	42.3us-gaap_GoodwillAcquiredDuringPeriod
Acme
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	67.3
Intangible assets	27.5
Goodwill recognized through acquisitions	22.4
Weighted average useful life	19 years
Turner
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	38.0
Intangible assets	21.3
Goodwill recognized through acquisitions	12.5
Weighted average useful life	19 years
EC&M
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	21.2
Intangible assets	8.5
Goodwill recognized through acquisitions	$ 7.4
Weighted average useful life	16 years

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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