Condensed Consolidating Financial Statements (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidating Statements of Operations
Net sales	$ 1,175.4	$ 1,102.1	$ 2,010.2	$ 1,895.6
Cost of goods sold	813.8	761.3	1,425.5	1,343.8
Gross profit	361.6	340.8	584.7	551.8
Operating Expenses:
Selling, general and administrative expenses	161.4	168.5	316.6	320.9
Losses and other expenses, net	0.2	2.3	7.5	5.4
Restructuring charges	0.5	0.1	1.3	0.2
(Gain) loss, net on sale of business and related property	(22.1)	0.0	(11.8)	0.0
Loss on assets held for sale	31.4	0.0	31.4	0.0
Income from equity method investments	(4.9)	(5.5)	(8.4)	(10.9)
Operating income	195.1	175.4	248.1	236.2
Interest expense, net	9.8	8.2	18.2	15.7
Other expense, net	0.8	(0.1)	1.4	(0.1)
Income from continuing operations before income taxes	184.5	167.3	228.5	220.6
Income tax benefit	45.3	50.9	51.4	60.7
Income from continuing operations	139.2	116.4	177.1	159.9
Loss from discontinued operations	(1.6)	(0.9)	(1.6)	(0.9)
Net income	137.6	115.5	175.5	159.0
Other comprehensive income (loss), net of tax	0.3	10.1	(23.6)	28.6
Comprehensive income	137.9	125.6	151.9	187.6
Eliminations [Member]
Condensed Consolidating Statements of Operations
Net sales	(186.2)	(177.5)	(346.7)	(329.1)
Cost of goods sold	(186.5)	(175.9)	(344.7)	(324.3)
Gross profit	0.3	(1.6)	(2.0)	(4.8)
Operating Expenses:
Selling, general and administrative expenses	(0.3)	(0.2)	(0.5)	(0.4)
Losses and other expenses, net	(0.1)	(0.1)	(0.2)	(0.1)
Restructuring charges	0.0	0.0	0.0	0.0
(Gain) loss, net on sale of business and related property	0.0		0.0
Loss on assets held for sale	0.0		0.0
Income from equity method investments	155.5	137.1	200.3	197.8
Operating income	(154.8)	(138.4)	(201.6)	(202.1)
Interest expense, net	0.0	0.0	0.0	0.0
Other expense, net	0.0	0.0	0.0	0.0
Income from continuing operations before income taxes	(154.8)	(138.4)	(201.6)	(202.1)
Income tax benefit	(0.1)	(0.2)	0.2	(1.0)
Income from continuing operations	(154.7)	(138.2)	(201.8)	(201.1)
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	(154.7)	(138.2)	(201.8)	(201.1)
Other comprehensive income (loss), net of tax	0.0	1.1	0.0	109.5
Comprehensive income	(154.7)	(137.1)	(201.8)	(91.6)
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	0.3	0.3	1.4	0.9
Restructuring charges	0.0	0.0	0.0	0.0
(Gain) loss, net on sale of business and related property	0.0		0.0
Loss on assets held for sale	0.0		0.0
Income from equity method investments	(139.6)	(120.6)	(180.2)	(169.3)
Operating income	139.3	120.3	178.8	168.4
Interest expense, net	2.4	7.4	4.8	14.7
Other expense, net	0.0	0.0	0.0	0.0
Income from continuing operations before income taxes	136.9	112.9	174.0	153.7
Income tax benefit	(0.7)	(2.6)	(1.5)	(5.3)
Income from continuing operations	137.6	115.5	175.5	159.0
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	137.6	115.5	175.5	159.0
Other comprehensive income (loss), net of tax	(2.3)	(1.5)	(9.4)	(72.8)
Comprehensive income	135.3	114.0	166.1	86.2
Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	1,057.8	968.7	1,774.1	1,655.0
Cost of goods sold	745.0	672.7	1,278.3	1,186.0
Gross profit	312.8	296.0	495.8	469.0
Operating Expenses:
Selling, general and administrative expenses	151.0	147.9	284.7	278.5
Losses and other expenses, net	(3.3)	1.9	0.7	3.8
Restructuring charges	0.0	0.0	0.7	0.1
(Gain) loss, net on sale of business and related property	(0.9)		(0.9)
Loss on assets held for sale	0.0		0.0
Income from equity method investments	(17.1)	(17.5)	(21.7)	(30.1)
Operating income	183.1	163.7	232.3	216.7
Interest expense, net	5.2	(0.8)	9.3	(1.7)
Other expense, net	0.7	0.0	1.4	0.0
Income from continuing operations before income taxes	177.2	164.5	221.6	218.4
Income tax benefit	43.8	47.2	49.2	54.3
Income from continuing operations	133.4	117.3	172.4	164.1
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	133.4	117.3	172.4	164.1
Other comprehensive income (loss), net of tax	11.9	0.3	(8.8)	(29.1)
Comprehensive income	145.3	117.6	163.6	135.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	303.8	310.9	582.8	569.7
Cost of goods sold	255.3	264.5	491.9	482.1
Gross profit	48.5	46.4	90.9	87.6
Operating Expenses:
Selling, general and administrative expenses	10.7	20.8	32.4	42.8
Losses and other expenses, net	3.3	0.2	5.6	0.8
Restructuring charges	0.5	0.1	0.6	0.1
(Gain) loss, net on sale of business and related property	(21.2)		(10.9)
Loss on assets held for sale	31.4		31.4
Income from equity method investments	(3.7)	(4.5)	(6.8)	(9.3)
Operating income	27.5	29.8	38.6	53.2
Interest expense, net	2.2	1.6	4.1	2.7
Other expense, net	0.1	(0.1)	0.0	(0.1)
Income from continuing operations before income taxes	25.2	28.3	34.5	50.6
Income tax benefit	2.3	6.5	3.5	12.7
Income from continuing operations	22.9	21.8	31.0	37.9
Loss from discontinued operations	(1.6)	(0.9)	(1.6)	(0.9)
Net income	21.3	20.9	29.4	37.0
Other comprehensive income (loss), net of tax	(9.3)	10.2	(5.4)	21.0
Comprehensive income	$ 12.0	$ 31.1	$ 24.0	$ 58.0