CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 247.8	$ 177.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	77.3	74.6
Amortization	3.3	2.5
Stock-based compensation	27.6	18.8
Non-cash restructuring charges	0.0	1.6
Pension settlement charge	3.4	2.7
Contingent consideration payments in excess of acquisition-date liability	(0.7)	(0.3)
Other non-cash items, net	(9.5)	(0.6)
Changes in assets and liabilities	(25.4)	(16.3)
Net cash provided by operating activities	323.8	260.8
Cash flows from investing activities:
Capital expenditures	(116.7)	(88.8)
Acquisition of business	0.0	(18.9)
Purchase of intangibles	(3.8)	0.0
Other, net	(1.4)	0.3
Net cash used in investing activities	(121.9)	(107.4)
Cash flows from financing activities:
Borrowings under revolving credit agreements	0.0	28.0
Repayments under revolving credit agreements	0.0	(28.0)
Repayments of long-term debt	(1.7)	0.0
Debt issuance costs	0.0	(0.9)
Dividend payments	(35.5)	(33.3)
Proceeds from stock-based compensation awards	19.7	25.5
Employee stock purchase plan contributions	4.6	4.0
Shares purchased under share repurchase programs	(115.5)	(83.1)
Net cash used in financing activities	(128.4)	(87.8)
Effect of exchange rates on cash	6.8	(7.0)
Net increase (decrease) in cash and cash equivalents	80.3	58.6
Cash, including cash equivalents at beginning of period	439.1	337.4
Cash, including cash equivalents at end of period	$ 519.4	$ 396.0