Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 1,149.5	$ 555.6	$ 2,107.0	$ 1,452.8
Other comprehensive income, net of tax (Note 10)	[1]	660.2	167.7	375.3	651.2
Comprehensive income		$ 1,809.7	$ 723.3	$ 2,482.3	$ 2,104.0

[1] Other comprehensive income for the three and nine months ended September 30, 2018 was all attributable to controlling interest. Other comprehensive income for the three and nine months ended September 30, 2017 consisted of $165.5 million and $664.6 million, respectively, of other comprehensive income attributable to controlling interest and $2.2 million and $(13.4) million of other comprehensive income (loss) attributable to noncontrolling interest during the same periods.