Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net Income (Loss) Attributable to Parent	$ 71.6	$ 53.5	$ 242.8	$ 174.2
Net (loss) income attributable to noncontrolling interest	0.7	0.6	1.9	0.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			105.9	102.5
Impairment charges			0.6	0.0
Loss on sale of assets			0.2	(2.6)
Gain (Loss) on Disposition of Business			0.6	0.0
Deferred income tax provision			2.2	7.5
Stock-based compensation expense			25.5	18.2
Pension and other postretirement expense			8.5	12.6
Pension contributions and other postretirement benefit payments			(12.4)	(16.3)
Changes in operating assets and liabilities:
Accounts receivable			(65.7)	(61.6)
Increase (Decrease) in Unbilled Receivables			(37.6)	0.0
Inventories			(94.3)	(85.4)
Accounts payable, trade			9.9	(55.7)
Other accrued expenses			(10.2)	(15.9)
Income taxes			0.5	59.6
Other, net			17.0	(18.2)
Net Cash Provided by Operating Activities			195.0	142.9
Investing Activities
Capital expenditures			(62.8)	(62.5)
Acquisitions, net of cash received			765.4	347.2
Proceeds from disposals of property, plant and equipment			1.1	6.8
Divestitures			14.0	0.0
Common Stock, Value, Outstanding				(4.2)
Proceeds from Sale and Maturity of Marketable Securities			2.3
Other			0.5	(0.3)
Net Cash Used by Investing Activities			(810.3)	(407.4)
Financing Activities
Cash dividends paid to shareholders			(64.2)	(62.4)
Purchase of treasury shares			(63.0)	(41.0)
Net proceeds from common share activity			12.7	27.7
Payments Related to Tax Withholding for Share-based Compensation			5.4	10.8
Proceeds from Accounts Receivable Securitization			145.2	51.2
Repayments of Accounts Receivable Securitization			114.9	25.3
Proceeds from Issuance of Long-term Debt			1,286.1	862.7
Payments on long-term debt			(533.1)	(574.4)
Payments of Financing Costs			0.9	1.1
Short-term debt activity, net			(3.9)	12.8
Proceeds from (Payments for) Other Financing Activities			(1.3)	(2.6)
Net Cash Used by Financing Activities			657.3	236.8
Effect of exchange rate changes on cash			(12.4)	16.6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			29.6	(11.1)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	155.0	$ 140.5	155.0	$ 140.5	$ 125.4	$ 151.6
Cash and cash equivalents beginning of period			121.6
Cash and cash equivalents end of period	$ 153.7		$ 153.7		$ 121.6