Earnings Per Share (Calculation of EPS) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
(Loss)/Income from continuing operations, net of taxes	$ (368.5)	$ 477.1	$ 127.6	$ 1,054.1
Loss from discontinued operations, net of taxes	(18.3)	(24.3)	(257.5)	(31.3)
Numerator for basic and diluted (loss)/earnings per share	$ (386.8)	$ 452.8	$ (129.9)	$ 1,022.8
Basic (in shares)	900.2	590.9	725.5	590.2
Share-based awards to employees (in shares)	0.0	2.5	0.0	3.0
Diluted (in shares)	900.2	593.4	725.5	593.2