Permanent and Temporary Equity (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity offering [Line Items]
Common Stock outstanding percentage of beneficial ownership acquired threshold for excess shares		9.00%
Preferred stock outstanding percentage of beneficial ownership acquired threshold for excess shares		9.90%
Maximum Deferral Payment Period of Purchase Price for Excess Shares		5 years
number of excess shares held by trustee		0
At-the-market equity offering program
Equity offering [Line Items]
Equity offering program, authorized offering amount		$ 1,000.0
Stock issued during period, shares, new issues		2,700,000	0	1,100,000
Shares issued, price per share		$ 66.75
Equity offering program, remaining authorized offering amount		$ 822.1
June 2019 Registered Public Offering
Equity offering [Line Items]
Stock issued during period, shares, new issues	12,700,000
Shares issued, price per share	$ 62.75