CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 177.8	$ 154.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	74.6	76.1
Amortization	2.5	2.0
Stock-based compensation	18.8	14.7
Non-cash restructuring charges	1.6	0.8
Pension settlement charge	2.7	0.0
Contingent consideration payments in excess of acquisition-date liability	(0.3)	(0.5)
Other non-cash items, net	(0.6)	(4.0)
Changes in assets and liabilities	(16.3)	(28.6)
Net cash provided by operating activities	260.8	215.4
Cash flows from investing activities:
Capital expenditures	(88.8)	(74.7)
Acquisition of business	(18.9)	0.0
Other, net	0.3	2.5
Net cash used in investing activities	(107.4)	(72.2)
Cash flows from financing activities:
Borrowings under revolving credit agreements	28.0	0.0
Repayments under revolving credit agreements	(28.0)	0.0
Debt issuance costs	(0.9)	0.0
Dividend payments	(33.3)	(31.0)
Proceeds from stock-based compensation awards	25.5	25.7
Employee stock purchase plan contributions	4.0	3.6
Shares purchased under share repurchase programs	(83.1)	(70.8)
Net cash used in financing activities	(87.8)	(72.5)
Effect of exchange rates on cash	(7.0)	(9.3)
Net increase in cash and cash equivalents	58.6	61.4
Cash and cash equivalents at beginning of period	337.4	235.9
Cash and cash equivalents at end of period	$ 396.0	$ 297.3