Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 284.0	$ 249.8	$ 237.2
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	104.5	93.3	76.4
Amortization of deferred financing costs and debt discount	0.7	1.7	1.1
Deferred income taxes	3.8	62.8	53.2
Stock-based compensation	17.6	16.1	17.9
Equity in earnings from affiliated companies	(3.3)	(2.5)	(2.0)
Excess tax benefits on stock-based compensation			(9.2)
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	20.2	(17.4)	(18.4)
(Increase) decrease in inventories	2.3	10.8	(25.0)
Increase in prepaid expenses and other current assets	(0.1)	(4.1)	(2.9)
Increase in other non-current assets	(8.0)	(13.7)	(11.6)
Decrease in accounts payable/accrued liabilities	(2.1)	(7.9)	(10.4)
Increase in other non-current liabilities		8.1	4.3
Other – net	9.1	4.4	(9.6)
Net cash provided by operating activities	428.7	401.4	301.0
Cash flows from investing activities
Capital expenditures	(278.1)	(327.9)	(305.3)
Acquisitions and investments in affiliated companies	(76.0)	(38.6)
Net cash used for investing activities	(354.1)	(366.5)	(305.3)
Cash flows from financing activities
Proceeds from issuance of senior notes	398.3		300.0
Issuance costs related to senior notes	(3.7)
Proceeds from settlements of treasury locks	10.0
Proceeds from Euro term loan	37.4	26.4
Repayments of Euro term loan	(4.1)
Borrowing from senior unsecured credit facility		78.0
Repayment of senior unsecured credit facility	(315.0)		(135.0)
Proceeds (repayment) of other debt, net	(0.5)	1.1	(1.2)
Deferred financing costs and discount related to long-term debt		(1.7)	(3.6)
Dividends paid	(42.6)	(39.8)	(38.3)
Repurchase of stock	(150.3)	(111.1)	(146.1)
Activity under stock plans	12.2	0.3	13.3
Net cash used for financing activities	(58.3)	(46.8)	(10.9)
Effect of exchange rate changes on cash and cash equivalents	8.6	(4.7)	(3.9)
Net increase (decrease) in cash and cash equivalents	24.9	(16.6)	(19.1)
Cash and cash equivalents at beginning of period	35.2	51.8	70.9
Cash and cash equivalents at end of period	60.1	35.2	51.8
Supplemental data:
Accrual basis additions to property, plant and equipment	$ 284.4	$ 320.2	$ 289.0