Condensed Consolidating Financial Statements (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidating Statements of Operations
Net sales	$ 1,030.2	$ 1,052.3	$ 3,040.4	$ 2,947.9
Cost of goods sold	728.3	738.6	2,153.8	2,082.4
Gross profit	301.9	313.7	886.6	865.5
Operating Expenses:
Selling, general and administrative expenses	149.4	158.7	466.1	479.6
Losses and other expenses, net	2.7	3.0	10.0	8.5
Restructuring charges	0.5	1.9	1.9	2.1
Loss (gain), net on sale of businesses and related property	6.2	0.0	25.8	0.0
Loss (gain) from natural disaster, net of Insurance recoveries	0.3	0.0	0.3	0.0
Income from equity method investments	(2.4)	(4.5)	(10.8)	(15.5)
Operating income	145.2	154.6	393.3	390.8
Interest expense, net	10.3	7.6	28.5	23.3
Other expense, net	1.1	0.0	2.4	(0.2)
Income from continuing operations before income taxes	133.8	147.0	362.4	367.7
Income tax benefit	25.8	43.0	77.3	103.8
Income from continuing operations	108.0	104.0	285.1	263.9
Loss from discontinued operations	0.0	(0.5)	(1.7)	(1.4)
Net income	108.0	103.5	283.4	262.5
Other comprehensive income (loss), net of tax	5.4	9.4	(18.2)	38.1
Comprehensive income	113.4	112.9	265.2	300.6
Eliminations [Member]
Condensed Consolidating Statements of Operations
Net sales	(183.9)	(153.3)	(530.6)	(482.4)
Cost of goods sold	(184.3)	(155.2)	(529.0)	(479.5)
Gross profit	0.4	1.9	(1.6)	(2.9)
Operating Expenses:
Selling, general and administrative expenses	(0.3)	(0.8)	(0.5)	(1.2)
Losses and other expenses, net	0.0	0.0	(0.3)	(0.1)
Restructuring charges	0.0	0.0	0.0	0.0
Loss (gain), net on sale of businesses and related property	0.0		0.0
Loss (gain) from natural disaster, net of Insurance recoveries	0.0		0.0
Income from equity method investments	154.6	128.9	354.9	326.7
Operating income	(153.9)	(126.2)	(355.7)	(328.3)
Interest expense, net	0.0	0.0	0.0	0.0
Other expense, net	0.0	(0.2)	0.0	(0.2)
Income from continuing operations before income taxes	(153.9)	(126.0)	(355.7)	(328.1)
Income tax benefit	0.1	0.7	0.2	(0.2)
Income from continuing operations	(154.0)	(126.7)	(355.9)	(327.9)
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	(154.0)	(126.7)	(355.9)	(327.9)
Other comprehensive income (loss), net of tax	0.0	0.0	0.0	0.0
Comprehensive income	(154.0)	(126.7)	(355.9)	(327.9)
Parent [Member]
Condensed Consolidating Statements of Operations
Net sales	0.0	0.0	0.0	0.0
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Operating Expenses:
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Losses and other expenses, net	0.2	0.2	1.7	1.1
Restructuring charges	0.0	0.0	0.0	0.0
Loss (gain), net on sale of businesses and related property	0.0		0.0
Loss (gain) from natural disaster, net of Insurance recoveries	0.0		0.0
Income from equity method investments	(109.7)	(108.2)	(289.9)	(277.5)
Operating income	109.5	108.0	288.2	276.4
Interest expense, net	2.0	6.2	6.8	20.9
Other expense, net	0.0	0.0	0.0	0.0
Income from continuing operations before income taxes	107.5	101.8	281.4	255.5
Income tax benefit	(0.5)	(1.7)	(2.0)	(7.0)
Income from continuing operations	108.0	103.5	283.4	262.5
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	108.0	103.5	283.4	262.5
Other comprehensive income (loss), net of tax	(2.5)	0.4	(11.9)	0.5
Comprehensive income	105.5	103.9	271.5	263.0
Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	930.5	905.6	2,704.6	2,560.6
Cost of goods sold	660.5	644.8	1,938.8	1,830.8
Gross profit	270.0	260.8	765.8	729.8
Operating Expenses:
Selling, general and administrative expenses	138.4	140.7	423.0	419.2
Losses and other expenses, net	1.9	1.9	2.3	5.8
Restructuring charges	0.0	1.2	0.8	1.3
Loss (gain), net on sale of businesses and related property	40.1		39.1
Loss (gain) from natural disaster, net of Insurance recoveries	(1.7)		(1.7)
Income from equity method investments	(45.7)	(21.7)	(67.4)	(52.0)
Operating income	137.0	138.7	369.7	355.5
Interest expense, net	5.0	(0.6)	14.4	(2.3)
Other expense, net	0.7	0.0	2.0	0.0
Income from continuing operations before income taxes	131.3	139.3	353.3	357.8
Income tax benefit	13.3	30.5	62.6	84.8
Income from continuing operations	118.0	108.8	290.7	273.0
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	118.0	108.8	290.7	273.0
Other comprehensive income (loss), net of tax	1.2	2.1	(7.5)	9.7
Comprehensive income	119.2	110.9	283.2	282.7
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	283.6	300.0	866.4	869.7
Cost of goods sold	252.1	249.0	744.0	731.1
Gross profit	31.5	51.0	122.4	138.6
Operating Expenses:
Selling, general and administrative expenses	11.3	18.8	43.6	61.6
Losses and other expenses, net	0.6	0.9	6.3	1.7
Restructuring charges	0.5	0.7	1.1	0.8
Loss (gain), net on sale of businesses and related property	(33.9)		(13.3)
Loss (gain) from natural disaster, net of Insurance recoveries	2.0		2.0
Income from equity method investments	(1.6)	(3.5)	(8.4)	(12.7)
Operating income	52.6	34.1	91.1	87.2
Interest expense, net	3.3	2.0	7.3	4.7
Other expense, net	0.4	0.2	0.4	0.0
Income from continuing operations before income taxes	48.9	31.9	83.4	82.5
Income tax benefit	12.9	13.5	16.5	26.2
Income from continuing operations	36.0	18.4	66.9	56.3
Loss from discontinued operations	0.0	(0.5)	(1.7)	(1.4)
Net income	36.0	17.9	65.2	54.9
Other comprehensive income (loss), net of tax	6.7	6.9	1.2	27.9
Comprehensive income	$ 42.7	$ 24.8	$ 66.4	$ 82.8