Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 3,232.0	$ (204.1)	$ 2,737.6
Other comprehensive income (loss):
Change in foreign currency translation gains (losses)		(440.7)	501.9	(436.4)
Change in net unrealized gains (losses) on securities		(8.8)	(181.3)	303.0
Change in defined benefit pension and retiree health benefit plans (Note 14)		569.4	(576.6)	(512.8)
Change in effective portion of cash flow hedges		(6.0)	27.8	11.7
Other comprehensive income (loss) before income taxes		113.9	(228.2)	(634.5)
Benefit (provision) for income taxes related to other comprehensive income (loss) items		(30.3)	402.7	(10.6)
Net other comprehensive income (loss)	[1]	83.6	174.5	(645.1)
Comprehensive income (loss)		$ 3,315.6	$ (29.6)	$ 2,092.5

[1] Other comprehensive income in 2018 consists of $72.6 million of other comprehensive income attributable to controlling interest and $11.0 million of other comprehensive income attributable to noncontrolling interest. Other comprehensive income in 2017 consists of $199.0 million of other comprehensive income attributable to controlling interest and $24.5 million of other comprehensive loss attributable to noncontrolling interest. Other comprehensive loss in 2016 consists of $693.3 million of other comprehensive loss attributable to controlling interest and $48.2 million of other comprehensive income attributable to noncontrolling interest.