Condensed Consolidating Financial Statements (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Revenues	$ 885.0	$ 1,032.9	$ 1,099.1	$ 790.3	$ 843.6	$ 1,030.2	$ 1,175.4	$ 834.8	$ 3,807.2	$ 3,883.9	$ 3,839.6
Cost of goods sold									2,727.4	2,772.7	2,714.4
Gross profit	247.8	298.3	332.1	201.6	224.5	301.9	361.6	223.2	1,079.8	1,111.2	1,125.2
Operating expenses:
Selling, general and administrative expenses									585.9	608.2	637.7
Losses (gains) and other expenses, net									8.3	13.4	7.1
Restructuring charges									10.3	3.0	3.2
Pension settlement									99.2	0.4	0.0
Interest Expense									47.5	38.3	30.6
Other Nonoperating Income (Expense)									2.3	3.3	(0.1)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									507.9	467.9	464.0
Income Tax Expense (Benefit)									99.1	107.6	156.9
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									408.8	360.3	307.1
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									(0.1)	(1.3)	(1.4)
Net Income (Loss) Attributable to Parent	$ 114.0	$ 114.7	$ 110.7	$ 69.3	$ 75.6	$ 108.0	$ 137.6	$ 37.9	408.7	359.0	305.7
Income (Loss) from Equity Method Investments									(13.4)	(12.0)	(18.4)
Operating income									656.9	509.9	494.5
Other comprehensive income (loss), net of tax									85.0	(31.4)	37.7
Comprehensive income									493.7	327.6	343.4
Gain (Loss) on Disposition of Business and Related Property									10.6	27.0	1.1
Loss(gain) from natural disaster, net of Insurance recoveries									(178.8)	(38.3)	0.0
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									0.0	0.0	0.0
Cost of goods sold									0.0	0.0	0.0
Gross profit									0.0	0.0	0.0
Operating expenses:
Selling, general and administrative expenses									0.0	0.0	0.0
Losses (gains) and other expenses, net									(0.5)	2.0	2.0
Restructuring charges									0.0	0.0	0.0
Pension settlement									0.0	0.0
Interest Expense									8.9	9.0	26.9
Other Nonoperating Income (Expense)									0.0	0.0	0.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									406.8	356.4	295.4
Income Tax Expense (Benefit)									(2.0)	(2.6)	(10.3)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									408.8	359.0	305.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net Income (Loss) Attributable to Parent									408.8	359.0	305.7
Income (Loss) from Equity Method Investments									(415.2)	(367.4)	(324.3)
Operating income									415.7	365.4	322.3
Other comprehensive income (loss), net of tax									7.4	(15.4)	1.7
Comprehensive income									416.2	343.6	307.4
Gain (Loss) on Disposition of Business and Related Property									0.0	0.0	0.0
Loss(gain) from natural disaster, net of Insurance recoveries									0.0	0.0
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									3,479.8	3,473.2	3,295.8
Cost of goods sold									2,513.2	2,500.6	2,359.6
Gross profit									966.6	972.6	936.2
Operating expenses:
Selling, general and administrative expenses									559.6	555.3	553.6
Losses (gains) and other expenses, net									6.4	5.4	3.3
Restructuring charges									9.3	1.1	2.1
Pension settlement									99.2	0.0
Interest Expense									29.7	18.5	(2.7)
Other Nonoperating Income (Expense)									0.5	1.5	0.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									492.1	459.1	453.7
Income Tax Expense (Benefit)									72.5	92.1	136.2
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									419.6	367.0	317.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net Income (Loss) Attributable to Parent									419.6	367.0	317.5
Income (Loss) from Equity Method Investments									(54.2)	(70.3)	(74.9)
Operating income									621.5	479.1	451.0
Other comprehensive income (loss), net of tax									74.5	(15.3)	5.5
Comprehensive income									494.1	351.7	323.0
Gain (Loss) on Disposition of Business and Related Property									2.8	40.3	1.1
Loss(gain) from natural disaster, net of Insurance recoveries									(178.8)	(38.3)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									555.7	1,129.6	1,144.2
Cost of goods sold									441.6	988.7	953.6
Gross profit									114.1	140.9	190.6
Operating expenses:
Selling, general and administrative expenses									26.3	53.6	85.0
Losses (gains) and other expenses, net									2.7	6.3	1.9
Restructuring charges									1.0	1.9	1.1
Pension settlement									0.0	0.4
Interest Expense									8.9	10.8	6.4
Other Nonoperating Income (Expense)									1.8	1.8	(0.1)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									76.1	89.3	110.8
Income Tax Expense (Benefit)									28.6	18.0	31.2
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									47.5	71.3	79.6
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									(0.1)	(1.3)	(1.4)
Net Income (Loss) Attributable to Parent									47.4	70.0	78.2
Income (Loss) from Equity Method Investments									(10.5)	(9.9)	(14.5)
Operating income									86.8	102.3	117.1
Other comprehensive income (loss), net of tax									3.1	(0.7)	30.5
Comprehensive income									50.5	69.3	108.7
Gain (Loss) on Disposition of Business and Related Property									7.8	(13.3)	0.0
Loss(gain) from natural disaster, net of Insurance recoveries									0.0	0.0
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									(228.3)	(718.9)	(600.4)
Cost of goods sold									(227.4)	(716.6)	(598.8)
Gross profit									(0.9)	(2.3)	(1.6)
Operating expenses:
Selling, general and administrative expenses									0.0	(0.7)	(0.9)
Losses (gains) and other expenses, net									(0.3)	(0.3)	(0.1)
Restructuring charges									0.0	0.0	0.0
Pension settlement									0.0	0.0
Interest Expense									0.0	0.0	0.0
Other Nonoperating Income (Expense)									0.0	0.0	0.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(467.1)	(436.9)	(395.9)
Income Tax Expense (Benefit)									0.0	0.1	(0.2)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									(467.1)	(437.0)	(395.7)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.0	0.0	0.0
Net Income (Loss) Attributable to Parent									(467.1)	(437.0)	(395.7)
Income (Loss) from Equity Method Investments									466.5	435.6	395.3
Operating income									(467.1)	(436.9)	(395.9)
Other comprehensive income (loss), net of tax									0.0	0.0	0.0
Comprehensive income									(467.1)	(437.0)	(395.7)
Gain (Loss) on Disposition of Business and Related Property									0.0	0.0	$ 0.0
Loss(gain) from natural disaster, net of Insurance recoveries									$ 0.0	$ 0.0