Consolidated Statements of Stockholders' (Deficit) Equity - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Treasury stock, shares								48,600,000
Beginning balance at Dec. 31, 2019	$ (170,200,000)	$ (1,300,000)	$ 900,000	$ 1,093,500,000	$ 2,148,700,000	$ (1,300,000)	$ (103,800,000)	$ (3,309,500,000)
Net income	244,600,000				244,600,000
Dividends, Common Stock, Cash	(88,300,000)				(88,300,000)
Foreign currency translation adjustments	(11,800,000)						(11,800,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	200,000						200,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1,200,000						1,200,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	18,400,000			18,400,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	1,700,000						1,700,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(3,200,000)
Stock Issued During Period, Value, Treasury Stock Reissued	2,300,000			$ (2,500,000)				$ 4,800,000
Stock Issued During Period, Shares, Treasury Stock Reissued								(200,000)
Treasury Stock, Shares, Acquired				0				500,000
Treasury Stock, Value, Acquired, Cost Method	(110,100,000)							$ (110,100,000)
Ending balance at Sep. 30, 2020	$ (115,700,000)		900,000	$ 1,109,400,000	2,303,700,000		(114,900,000)	$ (3,414,800,000)
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Earnings Per Share, Diluted	$ 6.34
Dividends	$ 2.31
Change in cash flow hedges, tax expense	500,000
Treasury stock, shares								48,900,000
Beginning balance at Jun. 30, 2020	(228,900,000)		900,000	1,102,400,000	2,201,500,000		(121,700,000)	$ (3,412,000,000)
Net income	131,700,000				131,700,000
Dividends, Common Stock, Cash	(29,500,000)				(29,500,000)
Foreign currency translation adjustments	6,000,000.0						6,000,000.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(300,000)						(300,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1,200,000						1,200,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,000,000.0			8,000,000.0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	2,300,000						2,300,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	3,200,000
Stock Issued During Period, Value, Treasury Stock Reissued	700,000			$ (1,000,000.0)				$ 1,700,000
Stock Issued During Period, Shares, Treasury Stock Reissued								(100,000)
Treasury Stock, Shares, Acquired				0				100,000
Treasury Stock, Value, Acquired, Cost Method	(4,500,000)							$ (4,500,000)
Ending balance at Sep. 30, 2020	$ (115,700,000)		900,000	$ 1,109,400,000	2,303,700,000		(114,900,000)	$ (3,414,800,000)
Earnings Per Share, Diluted	$ 3.42
Dividends	$ 0.77
Change in cash flow hedges, tax expense	1,300,000
Pension and post-retirement liability changes, tax expense	$ 100,000
Treasury stock, shares								48,900,000
Treasury stock, shares	48,820,969							48,800,000
Stock repurchase program, authorized amount	$ 4,000,000,000
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	380,400,000				380,400,000
Dividends, Common Stock, Cash	(97,100,000)				(97,100,000)
Foreign currency translation adjustments	(5,100,000)						(5,100,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(3,800,000)						(3,800,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	16,800,000			16,800,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	4,700,000						4,700,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	26,900,000
Stock Issued During Period, Value, Treasury Stock Reissued	2,500,000			$ (2,500,000)				$ 5,000,000.0
Stock Issued During Period, Shares, Treasury Stock Reissued								(100,000)
Treasury Stock, Shares, Acquired				0				1,900,000
Treasury Stock, Value, Acquired, Cost Method	(616,100,000)							$ (616,100,000)
Ending balance at Sep. 30, 2021	$ (334,800,000)		900,000	$ 1,127,500,000	2,669,100,000		(101,400,000)	$ (4,030,900,000)
Earnings Per Share, Diluted	$ 10.10
Dividends	$ 2.61
Change in cash flow hedges, tax expense	900,000
Pension and post-retirement liability changes, tax expense	3,800,000
Treasury stock, shares								50,000,000.0
Beginning balance at Jun. 30, 2021	(213,300,000)		900,000	1,128,900,000	2,576,600,000		(93,100,000)	$ (3,826,600,000)
Net income	126,300,000				126,300,000
Dividends, Common Stock, Cash	(33,800,000)				(33,800,000)
Foreign currency translation adjustments	(6,700,000)						(6,700,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(400,000)						(400,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	(600,000)			(600,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(1,200,000)						(1,200,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	6,300,000
Stock Issued During Period, Value, Treasury Stock Reissued	800,000			$ (800,000)				$ 1,600,000
Stock Issued During Period, Shares, Treasury Stock Reissued								600,000
Treasury Stock, Shares, Acquired				0				0
Treasury Stock, Value, Acquired, Cost Method	(205,900,000)							$ (205,900,000)
Ending balance at Sep. 30, 2021	$ (334,800,000)		$ 900,000	$ 1,127,500,000	$ 2,669,100,000		$ (101,400,000)	$ (4,030,900,000)
Earnings Per Share, Diluted	$ 3.41
Dividends	$ 0.92
Change in cash flow hedges, tax expense	200,000
Pension and post-retirement liability changes, tax expense	$ 600,000
Treasury stock, shares	50,581,517							50,600,000