Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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

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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.

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The number of businesses acquired by the entity during the period.

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

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Business Acquisitions - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended
Business Acquisitions - Narrative (Details) $ in Millions	Apr. 30, 2017 USD ($) acquisition	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 4.0
Cash used for acquisitions		$ 19.2	$ 172.2
Power
Business Acquisition [Line Items]
Number of businesses acquired \| acquisition		2
Consideration transferred		$ 9.3
Intangible assets		3.4
Goodwill		$ 4.0
Intangible assets, useful life		12 years
Tax deductible goodwill		$ 2.4
Electrical
Business Acquisition [Line Items]
Goodwill		$ 0.0
Subsequent Event
Business Acquisition [Line Items]
Number of businesses acquired \| acquisition	2
Consideration transferred	$ 90.0
Subsequent Event \| AEC
Business Acquisition [Line Items]
Consideration transferred	30.0
Subsequent Event \| iDevices
Business Acquisition [Line Items]
Consideration transferred	$ 60.0