Capital and Accumulated Other Comprehensive Income (Loss) (Equity Distribution Agreement Narrative) (Details) - USD ($)			9 Months Ended
	Oct. 01, 2020	Jan. 04, 2019	Sep. 30, 2020	Sep. 30, 2019	May 11, 2020
2019 Equity distribution agreement
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock			$ 893,000,000.0
Sale of Stock, Price Per Share			$ 146.89
Payments of Stock Issuance Costs			$ 9,000,000.0
Common stock issued in public offering (shares)			6,100,000	0
Net proceeds		$ 652,200,000
Shares issued , contribution to operating partnership			6,100,000
2019 Equity distribution agreement | Subsequent Event
Class of Stock [Line Items]
Common stock issued in public offering (shares)	5,220
Net proceeds	$ 800,000
Issuance of common stock, net of offering costs (shares)	5,220
Average share price	$ 159.09
Commission fees to sales agent	$ 8,000
Shares reserved for future issuance	749,400,000
Shares issued , contribution to operating partnership	5,220
2020 Equity distribution agreement
Class of Stock [Line Items]
Aggregate offering price of the distribution agreement maximum					$ 1,000,000,000.0