Consolidated Statements of Stockholders' (Deficit) Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Treasury stock, shares						48,600,000
Beginning balance at Dec. 31, 2019	$ (170,200,000)	$ 900,000	$ 1,093,500,000	$ 2,148,700,000	$ (103,800,000)	$ (3,309,500,000)
Net income	12,900,000			12,900,000
Dividends, Common Stock, Cash	(29,400,000)			(29,400,000)
Change in cash flow hedges, net of tax expense	(9,600,000)				(9,600,000)
Foreign currency translation adjustments	(20,300,000)				(20,300,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	600,000				600,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	3,700,000		3,700,000
Stock Issued During Period, Value, Treasury Stock Reissued	800,000		$ (2,000,000.0)			$ 2,800,000
Stock Issued During Period, Shares, Treasury Stock Reissued						(100,000)
Treasury Stock, Shares, Acquired			0			400,000
Treasury Stock, Value, Acquired, Cost Method	(105,500,000)					$ (105,500,000)
Ending balance at Mar. 31, 2020	(318,300,000)	900,000	$ 1,095,200,000	2,130,900,000	(133,100,000)	$ (3,412,200,000)
Cumulative Effect Period Of Adoption	$ (1,300,000)			(1,300,000)
Earnings Per Share, Diluted	$ 0.33
Dividends	$ 0.77
Change in cash flow hedges, tax expense	3,900,000
Pension and post-retirement liability changes, tax expense	$ 200,000
Treasury stock, shares						48,900,000
Treasury stock, shares	48,820,969					48,800,000
Beginning balance at Dec. 31, 2020	$ (17,100,000)	900,000	1,113,200,000	2,385,800,000	(97,200,000)	$ (3,419,800,000)
Net income	84,200,000			84,200,000
Dividends, Common Stock, Cash	(29,100,000)			(29,100,000)
Change in cash flow hedges, net of tax expense	4,100,000				4,100,000
Foreign currency translation adjustments	(2,500,000)				(2,500,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(3,600,000)				(3,600,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,500,000		8,500,000
Stock Issued During Period, Value, Treasury Stock Reissued	800,000		$ (1,400,000)			$ 2,200,000
Stock Issued During Period, Shares, Treasury Stock Reissued						0
Treasury Stock, Shares, Acquired			(30,000,000.0)			600,000
Treasury Stock, Value, Acquired, Cost Method	(206,000,000.0)					$ (176,000,000.0)
Ending balance at Mar. 31, 2021	$ (160,700,000)	$ 900,000	$ 1,090,300,000	$ 2,440,900,000	$ (99,200,000)	$ (3,593,600,000)
Earnings Per Share, Diluted	$ 2.20
Dividends	$ 0.77
Change in cash flow hedges, tax expense	1,100,000
Pension and post-retirement liability changes, tax expense	$ 3,500,000
Treasury stock, shares	49,396,668					49,400,000