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	112,900,000			112,900,000
Dividends, Common Stock, Cash	(58,800,000)			(58,800,000)
Change in cash flow hedges, net of tax expense	(600,000)				(600,000)
Foreign currency translation adjustments	(17,800,000)				(17,800,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	500,000				500,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	10,400,000		10,400,000
Stock Issued During Period, Value, Treasury Stock Reissued	1,600,000		$ (1,500,000)			$ 3,100,000
Stock Issued During Period, Shares, Treasury Stock Reissued						(100,000)
Treasury Stock, Shares, Acquired			0			400,000
Treasury Stock, Value, Acquired, Cost Method	(105,600,000)					$ (105,600,000)
Ending balance at Jun. 30, 2020	(228,900,000)	900,000	$ 1,102,400,000	2,201,500,000	(121,700,000)	$ (3,412,000,000.0)
adoption of new accounting standard	$ (1,300,000)			(1,300,000)
Earnings Per Share, Diluted	$ 2.93
Dividends	$ 1.54
Change in cash flow hedges, tax expense	800,000
Pension and post-retirement liability changes, tax expense	100,000
Treasury stock, shares						48,900,000
Beginning 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)
Net income	100,000,000.0			100,000,000.0
Dividends, Common Stock, Cash	(29,400,000)			(29,400,000)
Change in cash flow hedges, net of tax expense	9,100,000				9,100,000
Foreign currency translation adjustments	2,400,000				2,400,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(100,000)				(100,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6,700,000		6,700,000
Stock Issued During Period, Value, Treasury Stock Reissued	800,000		$ 500,000			$ 300,000
Stock Issued During Period, Shares, Treasury Stock Reissued						0
Treasury Stock, Shares, Acquired			0			0
Treasury Stock, Value, Acquired, Cost Method	(100,000)					$ (100,000)
Ending balance at Jun. 30, 2020	$ (228,900,000)	900,000	$ 1,102,400,000	2,201,500,000	(121,700,000)	$ (3,412,000,000.0)
Earnings Per Share, Diluted	$ 2.60
Dividends	$ 0.77
Change in cash flow hedges, tax expense	3,100,000
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	$ 3,000,000,000.0
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	254,200,000			254,200,000
Dividends, Common Stock, Cash	(63,400,000)			(63,400,000)
Change in cash flow hedges, net of tax expense	5,900,000				5,900,000
Foreign currency translation adjustments	1,600,000				1,600,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(3,400,000)				(3,400,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	17,500,000		17,500,000
Stock Issued During Period, Value, Treasury Stock Reissued	1,600,000		$ (1,800,000)			$ 3,400,000
Stock Issued During Period, Shares, Treasury Stock Reissued						(100,000)
Treasury Stock, Shares, Acquired			0			1,300,000
Treasury Stock, Value, Acquired, Cost Method	(410,200,000)					$ (410,200,000)
Ending 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)
Earnings Per Share, Diluted	$ 6.70
Dividends	$ 1.69
Change in cash flow hedges, tax expense	1,200,000
Pension and post-retirement liability changes, tax expense	3,200,000
Treasury stock, shares						49,400,000
Beginning 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)
Net income	170,000,000.0			170,000,000.0
Dividends, Common Stock, Cash	(34,300,000)			(34,300,000)
Change in cash flow hedges, net of tax expense	1,800,000				1,800,000
Foreign currency translation adjustments	4,200,000				4,200,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	100,000				100,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,900,000		8,900,000
Stock Issued During Period, Value, Treasury Stock Reissued	900,000		$ (300,000)			$ 1,200,000
Stock Issued During Period, Shares, Treasury Stock Reissued						(100,000)
Treasury Stock, Shares, Acquired			30,000,000.0			700,000
Treasury Stock, Value, Acquired, Cost Method	(204,200,000)					$ (234,200,000)
Ending 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)
Earnings Per Share, Diluted	$ 4.51
Dividends	$ 0.92
Change in cash flow hedges, tax expense	100,000
Pension and post-retirement liability changes, tax expense	$ 300,000
Treasury stock, shares	50,006,069					50,000,000.0