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Equity and Capital Equity and Capital - Common Stock (Details) | 6 Months Ended
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Jun. 30, 2018 USD ($) shares
Class of Stock [Line Items] |
Stock Repurchase Program Expiration Date | Feb. 06, 2020
Maximum [Member] |
Class of Stock [Line Items] |
Equity Issuances, Common Shares Authorized for Issuance | shares | 500,000,000
Parent Company [Member] | Common Stock [Member] |
Class of Stock [Line Items] |
Stock Repurchased and Retired During Period, Shares | shares | 2,145,209
Stock Repurchased and Retired During Period, Value | $ (124,989,000)
Parent Company [Member] | Common Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |
Class of Stock [Line Items] |
Stock Repurchased and Retired During Period, Value | 0
Parent Company [Member] | Common Stock [Member] | Average share price [Member] |
Class of Stock [Line Items] |
Stock Repurchased and Retired During Period, Value | $ (58.24)

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