Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
OPERATING ACTIVITIES
Net income (loss)	$ 53.8	$ 24.6	$ 15.9	$ 43.4	$ 154.8	$ 97.9
Reconciliation to net cash provided by (used for) operating activities:
Depreciation and amortization					75.3	76.1
Equity in earnings of unconsolidated affiliate	(3.8)		(5.9)		(13.9)	(19.5)
Costs related to legacy matters	3.7		74.6		52.1	78.8
Cash paid for legacy matters					13.8	18.1
Provision for (benefit from) income taxes	27.3		0.7		57.0	50.5
Cash paid for income taxes					(39.6)	(29.3)
Income tax refunds received					7.1	0.3
Loss on early extinguishment of debt	0.0		0.0		0.0	4.8
Interest expense and related financing costs	18.6		20.4		58.2	59.6
Cash paid for interest					(44.3)	(46.3)
Defined benefit pension expense					13.9	11.6
Cash paid under defined benefit pension arrangements					(12.3)	(61.8)
Changes in assets and liabilities, excluding effect of currency translation and acquisitions:
Trade accounts receivable					11.6	13.1
Inventories					(58.0)	(61.2)
Accounts payable					13.6	17.6
All other items, net					6.7	59.9
Net cash provided by (used for) operating activities					268.4	234.0
INVESTING ACTIVITIES
Cash paid for capital expenditures					(142.6)	(161.7)
Business acquired, net of cash acquired					(22.8)	(418.0)
Other investing activities, net					(4.4)	13.8
Net cash provided by (used for) investing activities					(169.8)	(565.9)
FINANCING ACTIVITIES
Borrowings under credit arrangements					10.3	998.9
Repayments under credit arrangements					(17.5)	(558.5)
Cash paid for debt financing costs					0.0	(11.8)
Cash paid for repurchases of common stock					(29.8)	(60.1)
Proceeds from exercise of stock options					19.1	6.7
Dividends paid to shareholders					(54.6)	(48.5)
Other financing activities, net					(4.9)	(3.5)
Net cash provided by (used for) financing activities					(77.4)	323.2
Effect of currency exchange rate changes on cash, cash equivalents, and restricted cash					(3.3)	(1.5)
Net increase (decrease) in cash, cash equivalents, and restricted cash					17.9	(10.2)
Cash, cash equivalents, and restricted cash, beginning of period		$ 201.0		$ 163.5	201.0	163.5	$ 163.5
Cash, cash equivalents, and restricted cash, end of period	$ 218.9		$ 153.3		218.9	153.3	$ 201.0
Supplemental disclosure of cash flow information
Capital expenditures in accounts payable					$ 39.4	$ 36.8