Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Net Income	$ 374,700,000	$ 305,500,000	$ 202,300,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	160,600,000	146,000,000.0	137,700,000
Impairment charges	(2,600,000)	(1,300,000)	(100,000)
Loss (gain) on sale of assets	(3,600,000)	300,000	(2,100,000)
Gain (Loss) on Disposition of Assets	(400,000)	0	0
Gain (Loss) on Disposition of Business	0	800,000	0
Deferred income tax benefit	8,900,000	21,400,000	400,000
Stock-based compensation expense	27,100,000	32,300,000	24,700,000
Pension and other postretirement expense	(2,200,000)	(20,700,000)	(28,900,000)
Pension and other postretirement benefit contributions and payments	(43,400,000)	(18,700,000)	(23,900,000)
Operating Lease, Expense	36,600,000	0	0
Operating Lease, Payments	(35,600,000)	0	0
Changes in operating assets and liabilities:
Accounts receivable	24,100,000	(66,400,000)	(42,300,000)
Increase (Decrease) in Unbilled Receivables	(12,600,000)	(21,800,000)	0
Inventories	50,700,000	(87,100,000)	(132,100,000)
Accounts payable, trade	19,900,000	(20,200,000)	70,700,000
Other accrued expenses	(26,800,000)	32,200,000	36,300,000
Income taxes	(14,200,000)	1,900,000	(36,200,000)
Other, net	(2,900,000)	27,100,000	(26,900,000)
Net Cash Provided by Operating Activities	550,100,000	332,500,000	236,800,000
Investing Activities
Capital expenditures	(140,600,000)	(112,600,000)	(104,700,000)
Acquisitions, net of cash acquired of $5.9 million in 2019, $30.1 million in 2018 and $35.4 million in 2017	(226,500,000)	(765,400,000)	(346,800,000)
Proceeds from disposals of property, plant and equipment	(6,300,000)	(1,500,000)	(7,100,000)
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	14,000,000.0	0
Payments to Acquire Marketable Securities	(4,200,000)	(2,800,000)	(3,600,000)
Other	100,000	100,000	(700,000)
Net Cash Used in Investing Activities	(364,900,000)	(865,200,000)	(448,700,000)
Financing Activities
Cash dividends paid to shareholders	(84,900,000)	(85,700,000)	(83,300,000)
Purchase of treasury shares	(62,700,000)	(98,500,000)	(43,400,000)
Proceeds from exercise of stock options	27,500,000	12,800,000	32,900,000
Payment, Tax Withholding, Share-based Payment Arrangement	(15,400,000)	(5,400,000)	(11,400,000)
Proceeds from long-term debt	662,800,000	1,391,100,000	927,800,000
Repayments of Long-term Debt	633,800,000	663,800,000	684,500,000
Deferred financing costs	(1,900,000)	(1,200,000)	(1,200,000)
Proceeds from Accounts Receivable Securitization	25,000,000.0	152,000,000.0	56,700,000
Repayments of Accounts Receivable Securitization	0	(139,900,000)	(42,700,000)
Short-term debt activity, net	(17,000,000.0)	(6,700,000)	19,900,000
Other	300,000	1,600,000	2,600,000
Net Cash Provided by (Used in) Financing Activities	(100,700,000)	553,100,000	168,200,000
Effect of exchange rate changes on cash	(1,400,000)	(12,700,000)	17,600,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	83,100,000	7,700,000	(26,100,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 216,200,000	$ 133,100,000	$ 125,400,000