Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total		Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Stockholders' Equity Attributable to Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2013	$ 2,075.0		$ 297.5	$ (477.2)	$ 654.3	$ 2,242.1	$ (645.2)	$ 2,071.5	$ 3.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	228.6	[1]	0.0	0.0	0.0	377.8	(149.2)	228.6	0.0
Cash dividends on common stock	(182.5)		0.0	0.0	0.0	(182.5)	0.0	(182.5)	0.0
Stock-based compensation and other	97.0		4.5	(15.9)	109.7	(1.3)	0.0	97.0	0.0
Stock Repurchased and Retired During Period, Value	(363.2)		(13.3)	0.0	(25.0)	(324.9)	0.0	(363.2)	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014	1,854.9		288.7	(493.1)	739.0	2,111.2	(794.4)	1,851.4	3.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	310.6	[1]	0.0	0.0	0.0	350.0	(39.4)	310.6	0.0
Cash dividends on common stock	(206.3)		0.0	0.0	0.0	(206.3)	0.0	(206.3)	0.0
Stock-based compensation and other	47.6		3.3	(30.0)	74.2	0.1	0.0	47.6	0.0
Stock Repurchased and Retired During Period, Value	(180.4)		(4.5)	0.0	(11.8)	(164.1)	0.0	(180.4)	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015	1,826.4		287.5	(523.1)	801.4	2,090.9	(833.8)	1,822.9	3.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	316.8	[1]	0.0	0.0	0.0	527.8	(211.0)	316.8	0.0
Cash dividends on common stock	(328.6)		0.0	0.0	0.0	(328.6)	0.0	(328.6)	0.0
Stock-based compensation and other	89.5		3.4	(22.2)	76.4	(0.2)	0.0	57.4	32.1
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	9,480.3		213.9	0.0	9,266.4	0.0	0.0	9,480.3	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2016	$ 11,384.4		$ 504.8	$ (545.3)	$ 10,144.2	$ 2,289.9	$ (1,044.8)	$ 11,348.8	$ 35.6

[1] Comprehensive income attributable to noncontrolling interests was not material.