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Shareholders' Equity - Dividends Declared (Details) - Dividend Paid - USD ($) $ / shares in Units, $ in Millions | Oct. 12, 2017 | Jul. 10, 2017 | Apr. 25, 2017 | Feb. 06, 2017 | Oct. 18, 2016 | Jul. 20, 2016 | Apr. 20, 2016 | Feb. 03, 2016 | Nov. 03, 2015 | Jul. 31, 2015 | Apr. 29, 2015 | Feb. 06, 2015
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Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.43 | $ 0.43 | $ 0.43 | $ 0.43 | $ 0.43 | $ 0.41 | $ 0.41 | $ 0.41
Aggregate Payment Amount | $ 58.3 | $ 58.3 | $ 58.4 | $ 52.5 | $ 48.8 | $ 48.7 | $ 48.7 | $ 48.5 | $ 48.5 | $ 46.3 | $ 46.3 | $ 46.0
Qualified |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.0176751 | $ 0.0176751 | $ 0.0176751 | $ 0.0175622 | $ 0.0493613 | $ 0.0493613 | $ 0.0493613 | $ 0.0493613 | $ 0.0370254 | $ 0.0353166 | $ 0.0353166 | $ 0.0353166
Non-Qualified |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | 0.2484259 | 0.2484259 | 0.2484259 | 0.2468402 | 0.2886402 | 0.2886402 | 0.2886402 | 0.2886402 | 0.2893354 | 0.2759814 | $ 0.2759814 | $ 0.2759814
Nondividend Distributions |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.2038990 | $ 0.2038990 | $ 0.2038990 | $ 0.2025975 | $ 0.0953319 | $ 0.0953319 | $ 0.0953319 | $ 0.0953319 | $ 0.1069725 | $ 0.1020353 |  |

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