Equity and Accumulated Other Comprehensive Loss, Net (Equity Distribution Agreement Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	May 12, 2020	Apr. 20, 2020	Mar. 31, 2020	Mar. 31, 2019	Jan. 04, 2019
Subsequent Event
Class of Stock [Line Items]
Issuance of common stock, net of offering costs (shares)		4,500,000
2019 Equity distribution agreement
Class of Stock [Line Items]
Aggregate offering price of the distribution agreement maximum					$ 1,000.0
Proceeds from Issuance of Common Stock			$ 6.8
Sale of Stock, Price Per Share			$ 138.17
Payments of Stock Issuance Costs			$ 0.1
Common stock issued in public offering (shares)			50,000	0
2019 Equity distribution agreement | Subsequent Event
Class of Stock [Line Items]
Net proceeds	$ 638.9	$ 638.9
Issuance of common stock, net of offering costs (shares)	4,500,000
Average share price	$ 142.43	$ 142.43
Commission fees to sales agent	$ 6.5	$ 6.5
Shares reserved for future issuance	347,800,000	347,800,000