Supplemental Guarantor Condensed Financial Information (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Cash Flows [Line Items]
Net cash flows of operating activities	$ (39.0)	$ 156.2	$ 199.7
Capital expenditures	(85.4)	(84.1)	(61.5)
Proceeds from properties sold	11.9	1.5	1.8
Reduction of cash due to Venezuela deconsolidation	0.0	0.0	(8.2)
Disposal of subsidiaries, net of cash disposed of	2.2	81.8	78.4
Disposal of subsidiaries, net of cash disposed of	0.0
Investment in restricted cash	(10.0)
Other	(0.1)	0.2	0.0
Net cash flows of investing activities	(81.4)	(0.6)	10.5
Dividends paid to shareholders	(37.4)	(35.6)	(35.3)
Intercompany accounts	0.0	0.0	0.0
Proceeds from debt	2,101.1	1,516.2	2,945.5
Repayments of debt	(1,967.3)	(1,635.2)	(3,167.2)
Purchase of noncontrolling interest	0.0	(18.0)	0.0
Dividends paid to noncontrolling interest	0.0	(0.1)	(2.5)
Impact of stock options and other	2.1	(0.4)	(0.6)
Proceeds from sale leaseback transaction	0.0	6.2	0.0
Net cash flows of financing activities	98.5	(166.9)	(260.1)
Effect of exchange rate changes on cash and cash equivalents	5.5	0.0	(43.5)
Increase (decrease) in cash and cash equivalents	(16.4)	(11.3)	(93.4)
Cash and cash equivalents — beginning of year	101.1	112.4	205.8
Cash and cash equivalents — end of year	84.7	101.1	112.4
Eliminations
Schedule of Cash Flows [Line Items]
Net cash flows of operating activities	0.0	0.0	(11.7)
Capital expenditures	0.0	0.0	0.0
Proceeds from properties sold	0.0	0.0	0.0
Reduction of cash due to Venezuela deconsolidation			0.0
Disposal of subsidiaries, net of cash disposed of	0.0	0.0	0.0
Disposal of subsidiaries, net of cash disposed of	(46.8)
Investment in restricted cash	0.0
Other	0.0	0.0	0.0
Net cash flows of investing activities	(46.8)	0.0	0.0
Dividends paid to shareholders	0.0	0.0	0.0
Intercompany accounts	46.8	0.0	11.7
Proceeds from debt	0.0	0.0	0.0
Repayments of debt	0.0	0.0	0.0
Purchase of noncontrolling interest		0.0
Dividends paid to noncontrolling interest		0.0	0.0
Impact of stock options and other	0.0	0.0	0.0
Proceeds from sale leaseback transaction		0.0
Net cash flows of financing activities	46.8	0.0	11.7
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents — beginning of year	0.0	0.0	0.0
Cash and cash equivalents — end of year	0.0	0.0	0.0
Parent
Schedule of Cash Flows [Line Items]
Intercompany accounts	137.4	28.1	158.3
Parent | Reportable Legal Entities
Schedule of Cash Flows [Line Items]
Net cash flows of operating activities	(102.0)	7.9	2.6
Capital expenditures	(0.1)	0.0	0.0
Proceeds from properties sold	0.0	0.0	0.0
Reduction of cash due to Venezuela deconsolidation			0.0
Disposal of subsidiaries, net of cash disposed of	0.0	0.0	0.0
Disposal of subsidiaries, net of cash disposed of	0.0
Investment in restricted cash	0.0
Other	0.0	0.0	0.0
Net cash flows of investing activities	(0.1)	0.0	0.0
Dividends paid to shareholders	(37.4)	(35.6)	(35.3)
Intercompany accounts	137.4	28.1	158.3
Proceeds from debt	0.0	0.0	0.0
Repayments of debt	0.0	0.0	(125.0)
Purchase of noncontrolling interest		0.0
Dividends paid to noncontrolling interest		0.0	0.0
Impact of stock options and other	2.1	(0.4)	(0.6)
Proceeds from sale leaseback transaction		0.0
Net cash flows of financing activities	102.1	(7.9)	(2.6)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0	0.0
Increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents — beginning of year	0.0	0.0	0.0
Cash and cash equivalents — end of year	0.0	0.0	0.0
Guarantor Subsidiaries | Reportable Legal Entities
Schedule of Cash Flows [Line Items]
Net cash flows of operating activities	20.5	63.2	179.2
Capital expenditures	(47.3)	(48.0)	(18.6)
Proceeds from properties sold	0.8	0.7	0.1
Reduction of cash due to Venezuela deconsolidation			0.0
Disposal of subsidiaries, net of cash disposed of	5.3	76.8	88.4
Disposal of subsidiaries, net of cash disposed of	46.8
Investment in restricted cash	0.0
Other	0.0	(1.0)	(0.2)
Net cash flows of investing activities	5.6	28.5	69.7
Dividends paid to shareholders	0.0	0.0	0.0
Intercompany accounts	(175.7)	(42.0)	(208.4)
Proceeds from debt	1,579.9	1,114.0	2,082.1
Repayments of debt	(1,435.9)	(1,165.7)	(2,091.3)
Purchase of noncontrolling interest		0.0
Dividends paid to noncontrolling interest		0.0	0.0
Impact of stock options and other	0.0	0.0	0.0
Proceeds from sale leaseback transaction		0.0
Net cash flows of financing activities	(31.7)	(93.7)	(217.6)
Effect of exchange rate changes on cash and cash equivalents	4.6	2.2	(31.7)
Increase (decrease) in cash and cash equivalents	(1.0)	0.2	(0.4)
Cash and cash equivalents — beginning of year	1.0	0.8	1.2
Cash and cash equivalents — end of year	0.0	1.0	0.8
Non- Guarantor Subsidiaries | Reportable Legal Entities
Schedule of Cash Flows [Line Items]
Net cash flows of operating activities	42.5	85.1	29.6
Capital expenditures	(38.0)	(36.1)	(42.9)
Proceeds from properties sold	11.1	0.8	1.7
Reduction of cash due to Venezuela deconsolidation			(8.2)
Disposal of subsidiaries, net of cash disposed of	(3.1)	5.0	(10.0)
Disposal of subsidiaries, net of cash disposed of	0.0
Investment in restricted cash	(10.0)
Other	(0.1)	1.2	0.2
Net cash flows of investing activities	(40.1)	(29.1)	(59.2)
Dividends paid to shareholders	0.0	0.0	0.0
Intercompany accounts	(8.5)	13.9	38.4
Proceeds from debt	521.2	402.2	863.4
Repayments of debt	(531.4)	(469.5)	(950.9)
Purchase of noncontrolling interest		(18.0)
Dividends paid to noncontrolling interest		(0.1)	(2.5)
Impact of stock options and other	0.0	0.0	0.0
Proceeds from sale leaseback transaction		6.2
Net cash flows of financing activities	(18.7)	(65.3)	(51.6)
Effect of exchange rate changes on cash and cash equivalents	0.9	(2.2)	(11.8)
Increase (decrease) in cash and cash equivalents	(15.4)	(11.5)	(93.0)
Cash and cash equivalents — beginning of year	100.1	111.6	204.6
Cash and cash equivalents — end of year	$ 84.7	$ 100.1	$ 111.6