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Equity and Capital Equity and Capital - Common Stock (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Feb. 04, 2020 | Jan. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock remaining available for Issuance |  |  |  | 500,000,000 |  | 500,000,000 |
Stock Repurchase Program, Authorized Amount |  | $ 250,000,000 |  |  |  |  |
Stock Repurchase Program Expiration Date |  | Feb. 05, 2021 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  | $ (32,778,000) | $ (213,851,000)
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 0 |  | 563,229 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ (32,800,000) |  |  | $ (6,000) | $ (37,000)
Common Stock [Member] | Average share price [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value Per Share |  |  | $ (58.17) |  |  |  |
ATM Equity Offering Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued under program |  |  |  |  |  |  | 0
ATM Equity Offering Program [Member] | Forward Equity Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issuable |  |  |  |  | 1,894,845 |  |
Sale of stock, average offering price |  |  |  |  | $ 67.99 |  |
Settlement date |  |  |  |  | Sep. 12, 2020 |  |
ATM Equity Offering Program [Member] | Forward Equity Offering [Member] | Parent Company [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares settled |  |  |  | 0 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Equity Issuances, Common Shares Authorized for Issuance |  |  |  | 500,000,000.0 |  | 500,000,000.0 |

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