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Equity - Treasury Stock (Details) - USD ($) shares in Millions		3 Months Ended	12 Months Ended
	Dec. 01, 2016	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Value of treasury stock acquired, cost method			$ 451,290,000	$ 50,000,000
Cash payments related to stock repurchases			$ 443,152,000	$ 50,000,000	$ 0
Retirement of treasury stock, shares (in shares)	84.8
2017 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired (in shares)			13.9	1.4
Value of treasury stock acquired, cost method			$ 451,300,000	$ 50,000,000.0
2017 Repurchase Program | Maximum
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased						$ 300,000,000.0
2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased			500,000,000.0
Remaining authorized share repurchase amount under repurchase program			298,700,000
Prior Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired (in shares)		9.4
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Value of treasury stock acquired, cost method			451,290,000	50,000,000	150,000,000
Carrying amount of retired stock					1,946,129,000
Treasury Stock Associated with Deferred Compensation Plans
Equity, Class of Treasury Stock [Line Items]
Value of treasury stock acquired, cost method			$ 2,500,000	$ 2,600,000	$ 6,800,000
Common Stock Withheld for Settlement of Employee Tax Liabilities
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired (in shares)			0.4	0.5	0.4
Value of treasury stock acquired, cost method			$ 15,200,000	$ 18,600,000	$ 8,300,000

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