Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2019	$ 11,883.8	$ 6.1	$ 8,643.5	$ 6,031.1	$ (999.7)	$ (1,797.2)
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)	20.8
Other comprehensive loss, net of tax	(656.3)					(656.3)
Issuance of restricted stock, net of shares withheld (in shares)		795,423
Issuance of restricted stock, net of shares withheld	0.6		0.6
Taxes related to the net share settlement of equity awards	(5.6)		(5.6)
Stock compensation expense	19.4		19.4
Balance at Mar. 31, 2020	11,262.7	$ 6.1	8,657.9	6,051.9	$ (999.7)	(2,453.5)
Balance (in shares) at Mar. 31, 2020		541,542,294
Balance (in shares) at Mar. 31, 2020					24,598,074
Balance at Dec. 31, 2020	22,954.1	$ 12.1	18,438.8	5,361.2	$ 0.0	(858.0)
Balance (in shares) at Dec. 31, 2020		1,206,895,644
Balance (in shares) at Dec. 31, 2020					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(1,037.6)
Other comprehensive loss, net of tax	(527.6)					(527.6)
Issuance of restricted stock, net of shares withheld (in shares)		1,635,326
Issuance of restricted stock, net of shares withheld	0.0	$ 0.0	0.0
Taxes related to the net share settlement of equity awards	(6.9)		(6.9)
Stock compensation expense	32.7		32.7
Balance at Mar. 31, 2021	$ 21,414.7	$ 12.1	$ 18,464.6	$ 4,323.6	$ 0.0	$ (1,385.6)
Balance (in shares) at Mar. 31, 2021		1,208,530,970
Balance (in shares) at Mar. 31, 2021					0