Business Acquisitions - Summary of Preliminary Estimate of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,760.1		$ 1,089.0
Total Estimate of Consideration Transferred, Net of Cash Acquired		1,119.4	$ 19.2
Aclara
Business Acquisition [Line Items]
Accounts receivable	$ 116.1
Inventories	76.9
Other current assets	11.7
Property, plant and equipment	31.5
Intangible assets	444.0	$ 444.0
Accounts payable	(50.5)
Other accrued liabilities	(67.5)
Deferred tax liabilities	(72.3)
Other non-current liabilities	(37.0)
Noncontrolling interest	(2.5)
Goodwill	669.0
Total Estimate of Consideration Transferred, Net of Cash Acquired	$ 1,119.4