Condensed Consolidating Financial Statements (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidating Statements of Operations
Net sales	$ 1,102.1	$ 1,019.2	$ 1,895.6	$ 1,734.4
Cost of goods sold	761.3	704.2	1,343.8	1,235.8
Gross profit	340.8	315.0	551.8	498.6
Operating Expenses:
Selling, general and administrative expenses	168.5	159.4	320.9	299.7
Losses and other expenses, net	2.3	0.4	5.4	4.7
Restructuring charges	0.1	0.8	0.2	0.6
Income from equity method investments	(5.5)	(6.3)	(10.9)	(10.8)
Operating income	175.4	160.7	236.2	204.4
Interest expense, net	8.2	6.8	15.7	12.7
Other expense, net	(0.1)	(0.2)	(0.1)	(0.3)
Income from continuing operations before income taxes	167.3	154.1	220.6	192.0
Income tax benefit	50.9	42.9	60.7	55.9
Income from continuing operations	116.4	111.2	159.9	136.1
Loss from discontinued operations	(0.9)	(0.5)	(0.9)	(0.5)
Net income	115.5	110.7	159.0	135.6
Other comprehensive income (loss), net of tax	10.1	4.1	28.6	18.1
Comprehensive income	125.6	114.8	187.6	153.7
Eliminations [Member]
Condensed Consolidating Statements of Operations
Net sales	(177.5)	(48.7)	(329.1)	(91.1)
Cost of goods sold	(175.9)	(48.7)	(324.3)	(89.1)
Gross profit	(1.6)	0.0	(4.8)	(2.0)
Operating Expenses:
Selling, general and administrative expenses	(0.2)	0.0	(0.4)	0.0
Losses and other expenses, net	(0.1)	(0.1)	(0.1)	0.0
Restructuring charges	0.0	0.0	0.0	0.0
Income from equity method investments	137.1	123.9	197.8	151.4
Operating income	(138.4)	(123.8)	(202.1)	(153.4)
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	(138.4)	(123.8)	(202.1)	(153.4)
Income tax benefit	(0.2)	0.1	(1.0)	(0.7)
Income from continuing operations	(138.2)	(123.9)	(201.1)	(152.7)
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	(138.2)	(123.9)	(201.1)	(152.7)
Other comprehensive income (loss), net of tax	1.1	0.8	109.5	1.8
Comprehensive income	(137.1)	(123.1)	(91.6)	(150.9)
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	0.3	0.0	0.9	(0.6)
Restructuring charges	0.0	0.0	0.0	0.0
Income from equity method investments	(120.6)	(115.5)	(169.3)	(143.5)
Operating income	120.3	115.5	168.4	144.1
Interest expense, net	7.4	6.3	14.7	11.7
Other expense, net	0.0	0.0	0.0	0.0
Income from continuing operations before income taxes	112.9	109.2	153.7	132.4
Income tax benefit	(2.6)	(1.5)	(5.3)	(3.1)
Income from continuing operations	115.5	110.7	159.0	135.5
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	115.5	110.7	159.0	135.5
Other comprehensive income (loss), net of tax	(1.5)	0.3	(72.8)	4.9
Comprehensive income	114.0	111.0	86.2	140.4
Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	968.7	884.5	1,655.0	1,498.3
Cost of goods sold	672.7	611.7	1,186.0	1,072.4
Gross profit	296.0	272.8	469.0	425.9
Operating Expenses:
Selling, general and administrative expenses	147.9	139.9	278.5	258.6
Losses and other expenses, net	1.9	0.7	3.8	3.1
Restructuring charges	0.0	1.0	0.1	1.0
Income from equity method investments	(17.5)	(9.5)	(30.1)	(9.5)
Operating income	163.7	140.7	216.7	172.7
Interest expense, net	(0.8)	(0.5)	(1.7)	(1.0)
Other expense, net	0.0	0.0	0.0	0.0
Income from continuing operations before income taxes	164.5	141.2	218.4	173.7
Income tax benefit	47.2	34.8	54.3	46.8
Income from continuing operations	117.3	106.4	164.1	126.9
Loss from discontinued operations	0.0	0.0	0.0	0.0
Net income	117.3	106.4	164.1	126.9
Other comprehensive income (loss), net of tax	0.3	0.3	(29.1)	2.4
Comprehensive income	117.6	106.7	135.0	129.3
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	310.9	183.4	569.7	327.2
Cost of goods sold	264.5	141.2	482.1	252.5
Gross profit	46.4	42.2	87.6	74.7
Operating Expenses:
Selling, general and administrative expenses	20.8	19.5	42.8	41.1
Losses and other expenses, net	0.2	(0.2)	0.8	2.2
Restructuring charges	0.1	(0.2)	0.1	(0.4)
Income from equity method investments	(4.5)	(5.2)	(9.3)	(9.2)
Operating income	29.8	28.3	53.2	41.0
Interest expense, net	1.6	1.0	2.7	2.0
Other expense, net	(0.1)	(0.2)	(0.1)	(0.3)
Income from continuing operations before income taxes	28.3	27.5	50.6	39.3
Income tax benefit	6.5	9.5	12.7	12.9
Income from continuing operations	21.8	18.0	37.9	26.4
Loss from discontinued operations	(0.9)	(0.5)	(0.9)	(0.5)
Net income	20.9	17.5	37.0	25.9
Other comprehensive income (loss), net of tax	10.2	2.7	21.0	9.0
Comprehensive income	$ 31.1	$ 20.2	$ 58.0	$ 34.9