Consolidated Statements of Equity - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock [Member]	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2018	$ 12,167,100,000		$ 6,000,000.0	$ 8,591,400,000	$ 6,010,700,000		$ (999,700,000)	$ (1,441,300,000)
Balance (in shares) at Dec. 31, 2018			539,289,665
Balance (in shares) at Dec. 31, 2018							23,490,867
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(3,700,000)
Other comprehensive loss, net of tax	(746,300,000)							(746,300,000)
Stock options exercised, net of shares tendered for payment (in shares)			1,449,836
Issuance of restricted stock, net of shares withheld	8,100,000			8,100,000
Taxes related to the net share settlement of equity awards	(12,800,000)			(12,800,000)
Stock compensation expense	50,900,000			50,900,000
Balance at Sep. 30, 2019	11,463,400,000		$ 6,100,000	8,637,600,000	6,010,600,000		$ (999,700,000)	(2,191,200,000)
Balance (in shares) at Sep. 30, 2019			540,739,501
Balance (in shares) at Sep. 30, 2019							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	$ (3,700,000)
Treasury Stock, Shares, Retired	100,000		100,000				1,107,207
Balance at Jun. 30, 2019	$ 11,902,800,000	$ 0	$ 6,100,000	8,617,300,000	5,820,800,000	$ 3,600,000	$ (999,700,000)	(1,541,700,000)	$ (3,600,000)
Balance (in shares) at Jun. 30, 2019			540,459,996
Balance (in shares) at Jun. 30, 2019							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	189,800,000
Other comprehensive loss, net of tax	(649,500,000)							(649,500,000)
Stock options exercised, net of shares tendered for payment (in shares)			279,505
Issuance of restricted stock, net of shares withheld	4,200,000			4,200,000
Stock compensation expense	16,100,000			16,100,000
Balance at Sep. 30, 2019	11,463,400,000		$ 6,100,000	8,637,600,000	6,010,600,000		$ (999,700,000)	(2,191,200,000)
Balance (in shares) at Sep. 30, 2019			540,739,501
Balance (in shares) at Sep. 30, 2019							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	189,800,000
Balance at Dec. 31, 2019	$ 11,883,800,000		$ 6,100,000	8,643,500,000	6,031,100,000		$ (999,700,000)	(1,797,200,000)
Balance (in shares) at Dec. 31, 2019	540,746,871
Balance (in shares) at Dec. 31, 2019							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	$ 245,900,000
Other comprehensive loss, net of tax	373,400,000							373,400,000
Stock options exercised, net of shares tendered for payment (in shares)			803,184
Issuance of restricted stock, net of shares withheld	600,000		$ 0	600,000
Taxes related to the net share settlement of equity awards	(5,600,000)			(5,600,000)
Stock compensation expense	49,800,000			49,800,000
Balance at Sep. 30, 2020	$ 12,547,900,000		6,100,000	8,688,300,000	6,277,000,000.0		$ (999,700,000)	(1,423,800,000)
Balance (in shares) at Sep. 30, 2020	541,550,055
Balance (in shares) at Sep. 30, 2020							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	$ 245,900,000
Balance at Jun. 30, 2020	11,746,200,000		$ 6,100,000	8,673,200,000	6,091,500,000		$ (999,700,000)	(2,024,900,000)
Balance (in shares) at Jun. 30, 2020			541,545,308
Balance (in shares) at Jun. 30, 2020							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	185,700,000
Other comprehensive loss, net of tax	601,100,000							601,100,000
Stock options exercised, net of shares tendered for payment (in shares)			4,747
Issuance of restricted stock, net of shares withheld	0		$ 0	0
Stock compensation expense	15,100,000			15,100,000
Balance at Sep. 30, 2020	$ 12,547,900,000		$ 6,100,000	$ 8,688,300,000	$ 6,277,000,000.0		$ (999,700,000)	$ (1,423,800,000)
Balance (in shares) at Sep. 30, 2020	541,550,055
Balance (in shares) at Sep. 30, 2020							24,598,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other	$ (200,000)
Net earnings (loss)	$ 185,700,000