Condensed Consolidating Financial Statements (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Consolidating Statements of Operations
Net sales	$ 834.8	$ 793.4
Cost of goods sold	611.6	582.5
Gross profit	223.2	210.9
Operating Expenses:
Selling, general and administrative expenses	155.2	152.4
Losses and other expenses, net	7.3	3.1
Restructuring charges	0.9	0.1
Loss on assets held for sale	10.3	0.0
Income from equity method investments	(3.5)	(5.5)
Operating income	53.0	60.8
Interest expense, net	8.4	7.4
Other expense, net	0.6	0.0
Income from continuing operations before income taxes	44.0	53.4
Income tax benefit	6.1	9.9
Income from continuing operations	37.9	43.5
Loss from discontinued operations	0.0	0.0
Net income	37.9	43.5
Other comprehensive income (loss), net of tax	(23.9)	18.6
Comprehensive income	14.0	62.1
Eliminations [Member]
Condensed Consolidating Statements of Operations
Net sales	(160.5)	(151.7)
Cost of goods sold	(158.3)	(148.5)
Gross profit	(2.2)	(3.2)
Operating Expenses:
Selling, general and administrative expenses	(0.2)	(0.2)
Losses and other expenses, net	(0.1)	(0.1)
Restructuring charges	0.0	0.0
Loss on assets held for sale	0.0
Income from equity method investments	44.7	60.7
Operating income	(46.6)	(63.6)
Interest expense, net	0.0	0.0
Other expense, net	0.0	0.0
Income from continuing operations before income taxes	(46.6)	(63.6)
Income tax benefit	0.2	(0.8)
Income from continuing operations	(46.8)	(62.8)
Loss from discontinued operations	0.0	0.0
Net income	(46.8)	(62.8)
Other comprehensive income (loss), net of tax	0.0	108.4
Comprehensive income	(46.8)	45.6
Parent [Member]
Condensed Consolidating Statements of Operations
Net sales	0.0	0.0
Cost of goods sold	0.0	0.0
Gross profit	0.0	0.0
Operating Expenses:
Selling, general and administrative expenses	0.0	0.0
Losses and other expenses, net	1.2	0.6
Restructuring charges	0.0	0.0
Loss on assets held for sale	0.0
Income from equity method investments	(40.6)	(48.6)
Operating income	39.4	48.0
Interest expense, net	2.4	7.2
Other expense, net	0.0	0.0
Income from continuing operations before income taxes	37.0	40.8
Income tax benefit	(0.9)	(2.7)
Income from continuing operations	37.9	43.5
Loss from discontinued operations	0.0	0.0
Net income	37.9	43.5
Other comprehensive income (loss), net of tax	(7.1)	(71.2)
Comprehensive income	30.8	(27.7)
Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	716.3	686.3
Cost of goods sold	533.4	513.3
Gross profit	182.9	173.0
Operating Expenses:
Selling, general and administrative expenses	133.7	130.5
Losses and other expenses, net	4.0	2.0
Restructuring charges	0.7	0.0
Loss on assets held for sale	0.0
Income from equity method investments	(4.6)	(12.7)
Operating income	49.1	53.2
Interest expense, net	4.1	(0.8)
Other expense, net	0.6	0.0
Income from continuing operations before income taxes	44.4	54.0
Income tax benefit	5.5	7.1
Income from continuing operations	38.9	46.9
Loss from discontinued operations	0.0	0.0
Net income	38.9	46.9
Other comprehensive income (loss), net of tax	(20.7)	(29.4)
Comprehensive income	18.2	17.5
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations
Net sales	279.0	258.8
Cost of goods sold	236.5	217.7
Gross profit	42.5	41.1
Operating Expenses:
Selling, general and administrative expenses	21.7	22.1
Losses and other expenses, net	2.2	0.6
Restructuring charges	0.2	0.1
Loss on assets held for sale	10.3
Income from equity method investments	(3.0)	(4.9)
Operating income	11.1	23.2
Interest expense, net	1.9	1.0
Other expense, net	0.0	0.0
Income from continuing operations before income taxes	9.2	22.2
Income tax benefit	1.3	6.3
Income from continuing operations	7.9	15.9
Loss from discontinued operations	0.0	0.0
Net income	7.9	15.9
Other comprehensive income (loss), net of tax	3.9	10.8
Comprehensive income	$ 11.8	$ 26.7