CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 74.3	$ 55.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	24.9	24.9
Amortization	1.1	0.6
Stock-based compensation	5.4	6.2
Non-cash restructuring charges	0.0	0.3
Pension settlement charge	1.4	0.0
Contingent consideration payments in excess of acquisition-date liability	(0.1)	(0.2)
Other non-cash items, net	(4.3)	(0.8)
Changes in assets and liabilities	(45.6)	(38.8)
Net cash provided by operating activities	57.1	47.6
Cash flows from investing activities:
Capital expenditures	(32.1)	(28.8)
Other, net	0.2	0.1
Net cash used in investing activities	(31.9)	(28.7)
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	(0.6)	0.0
Issuance of long-term debt	0.0	(0.8)
Dividend payments	(11.8)	(11.1)
Proceeds from stock-based compensation awards	6.3	3.3
Employee stock purchase plan contributions	1.3	1.2
Shares purchased under share repurchase programs	(115.5)	(83.1)
Net cash used in financing activities	(120.3)	(90.5)
Effect of exchange rates on cash	(8.7)	(0.3)
Net decrease in cash and cash equivalents	(103.8)	(71.9)
Cash and cash equivalents at beginning of period	439.1	337.4
Cash and cash equivalents at end of period	$ 335.3	$ 265.5