Condensed Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,175.8	$ 1,169.5	$ 1.3	$ 41.1	$ 1,457.4	$ (330.3)	$ 6.3
Dividends [Abstract]
Common Stock, Shares, Outstanding			1,309.1
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 25.0	25.0	$ 0.0	25.0	0.0	0.0	0.0
Cash dividends declared per share	$ 1.08
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 2,792.2	2,796.4	0.0	0.0	2,796.4	0.0	(4.2)
Other comprehensive income/(loss)	(18.7)	(18.7)	0.0	0.0	0.0	(18.7)	0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	258.0	258.0	0.0	258.0	0.0	0.0	0.0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	227.4	227.4	0.0	227.4	0.0	0.0	0.0
Stock Repurchased and Retired During Period, Value	(7,954.3)	(7,954.3)	(0.1)	(510.4)	(7,443.8)	0.0	0.0
Dividends, Cash	(1,319.5)	(1,319.5)	$ 0.0	0.0	(1,319.5)	0.0	0.0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			13.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.3
Stock Repurchased and Retired During Period, Shares			(116.1)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0.5	0.0	$ 0.0	0.0	0.0	0.0	0.5
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(5,035.2)	(5,036.9)	$ 1.2	41.1	(4,807.7)	(271.5)	1.7
Common Stock, Shares, Outstanding			1,210.0
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 8.6	8.6	$ 0.0	8.6	0.0	0.0	0.0
Cash dividends declared per share	$ 0.36
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,373.2	1,372.8	0.0	0.0	1,372.8	0.0	0.4
Other comprehensive income/(loss)	(77.5)	(77.5)	0.0	0.0	0.0	(77.5)	0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	64.0	64.0	0.0	64.0	0.0	0.0	0.0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	24.4	24.4	0.0	24.4	0.0	0.0	0.0
Stock Repurchased and Retired During Period, Value	(241.1)	(241.1)	0.0	(97.0)	(144.1)	0.0	0.0
Dividends, Cash	(434.9)	(434.9)	$ 0.0	0.0	(434.9)	0.0	0.0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			3.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.1
Stock Repurchased and Retired During Period, Shares			(6.8)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0.5	0.0	$ 0.0	0.0	0.0	0.0	0.5
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(4,319.0)	(4,320.6)	$ 1.2	41.1	(4,013.9)	(349.0)	1.6
Common Stock, Shares, Outstanding			1,206.5
Cumulative Effect of New Accounting Pronouncement in Period of Adoption	495.6	495.6	$ 0.0	0.0	495.6	0.0	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,231.0)	(6,232.2)	$ 1.2	41.1	(5,771.2)	(503.3)	1.2
Common Stock, Shares, Outstanding			1,184.6
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 28.3	28.3	$ 0.0	28.3	0.0	0.0	0.0
Cash dividends declared per share	$ 1.23
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 532.0	535.7	0.0	0.0	535.7	0.0	(3.7)
Other comprehensive income/(loss)	(31.4)	(31.4)	0.0	0.0	0.0	(31.4)	0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	190.7	190.7	0.0	190.7	0.0	0.0	0.0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(18.3)	(18.3)	0.0	(18.3)	0.0	0.0	0.0
Stock Repurchased and Retired During Period, Value	(1,675.0)	(1,675.0)	0.0	(126.4)	(1,548.6)	0.0	0.0
Dividends, Cash	(1,436.9)	(1,436.7)	$ 0.0	0.0	(1,436.7)	0.0	(0.2)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			4.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.4
Stock Repurchased and Retired During Period, Shares			(20.3)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,532.9)	(7,530.1)	$ 1.2	41.1	(7,050.6)	(521.8)	(2.8)
Common Stock, Shares, Outstanding			1,168.1
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 9.8	9.8	$ 0.0	9.8	0.0	0.0	0.0
Cash dividends declared per share	$ 0.41
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (678.1)	(678.4)	0.0	0.0	(678.4)	0.0	0.3
Other comprehensive income/(loss)	(8.1)	(8.1)	0.0	0.0	0.0	(8.1)	0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	42.3	42.3	0.0	42.3	0.0	0.0	0.0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	22.2	22.2	0.0	22.2	0.0	0.0	0.0
Stock Repurchased and Retired During Period, Value	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Dividends, Cash	(479.5)	(479.3)	$ 0.0	0.0	(479.3)	0.0	(0.2)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			0.6
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.2
Stock Repurchased and Retired During Period, Shares			0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(8,624.3)	(8,621.6)	$ 1.2	115.4	(8,208.3)	(529.9)	(2.7)
Common Stock, Shares, Outstanding			1,168.9
Cumulative Effect of New Accounting Pronouncement in Period of Adoption	$ 17.3	$ 17.3	$ 0.0	$ 0.0	$ 12.5	$ 4.8	$ 0.0