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Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details) - Construction Services - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2018
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet
Impairment of assets held for sale, including goodwill		$ 168.2
Disposal Group as held for sale
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet
Loss on disposal of portion of assets in the disposal group	$ 2.1
Impairment of goodwill			$ 125.4
Impairment of intangible and other noncurrent assets			$ 42.8
Accounts receivable included in Current assets held for sale				$ 44.8
Property plant and equipment included in Current assets held for sale				13.6
Accounts payable included in Current liabilities held for sale				$ 18.4

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The amount of accounts receivable included in current assets held for sale.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount classified as accounts payable attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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