Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ (9.6)	$ 42.1	$ 76.4	$ 24.6	$ 32.5	$ 101.0
Reconciliation to net cash provided by (used for) operating activities:
Depreciation and amortization					50.9	49.8
Equity in earnings of unconsolidated affiliate	(3.4)		(6.0)		(4.6)	(10.1)
Costs related to legacy matters	2.8		1.5		5.5	48.4
Cash paid for legacy matters					12.3	7.8
Provision for (benefit from) income taxes	6.4		18.8		22.1	29.7
Cash paid for income taxes					(24.4)	(20.3)
Income tax refunds received					7.3	7.1
Interest expense and related financing costs	19.2		19.6		37.5	39.6
Defined benefit pension expense					6.6	9.4
Cash paid under defined benefit pension arrangements					(8.4)	(8.0)
Net (gain) loss on sales of investments and disposals of assets					20.9	1.2
Changes in assets and liabilities, excluding effect of currency translation and acquisitions:
Trade accounts receivable					84.7	(24.2)
Inventories					41.7	(37.4)
Accounts payable					(38.0)	13.1
All other items, net					0.1	(7.0)
Net cash provided by (used for) operating activities					184.6	144.9
INVESTING ACTIVITIES
Cash paid for capital expenditures					(95.0)	(101.5)
Business acquired, net of cash acquired					0.0	(22.8)	$ (22.8)
Other investing activities, net					(24.2)	(3.0)
Net cash provided by (used for) investing activities					(119.2)	(127.3)
FINANCING ACTIVITIES
Borrowings under credit arrangements					9.1	6.9
Repayments of Debt and Lease Obligation					12.8	12.3
Proceeds from Issuance of Unsecured Debt					750.0	0.0
Cash paid for debt financing costs					(10.3)	0.0
Cash paid for repurchases of common stock					(40.4)	(29.8)
Proceeds from exercise of stock options					0.0	18.0
Dividends paid to shareholders					(40.4)	(36.6)
Other financing activities, net					(4.2)	(4.9)
Net cash provided by (used for) financing activities					651.0	(58.7)
Effect of currency exchange rate changes on cash, cash equivalents, and restricted cash					(1.5)	0.0
Net increase (decrease) in cash, cash equivalents, and restricted cash					714.9	(41.1)
Cash, cash equivalents, and restricted cash, beginning of period		$ 282.9		$ 201.0	282.9	201.0	201.0
Cash, cash equivalents, and restricted cash, end of period	$ 997.8		$ 159.9		997.8	159.9	$ 282.9
Supplemental disclosure of cash flow information
Interest Paid, Excluding Capitalized Interest, Operating Activities					32.6	34.8
Capital expenditures in accounts payable					18.5	34.8
Expenditures for other investing activities included in accounts payable					$ 3.7	$ 24.5