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Notes Payable - Note Issuances Narrative (Details) - Notes Payable £ in Millions, $ in Millions | 1 Months Ended
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Jun. 30, 2019 USD ($) | May 31, 2019 GBP (£) | May 31, 2019 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
2.730% notes, issued in May 2019 and due in May 2034 |  |  |  |  |  |
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  | £ 315.0 | $ 398.1 |  |  |
3.250% notes, issued in June 2019 and due in June 2029 |  |  |  |  |  |
Debt |  |  |  |  |  |
Proceeds from issuance of debt | $ 492.2 |  |  |  |  |
3.875% notes, issued in April 2018 and due in April 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 493.1 |  |
Notes issued in December 2017 |  |  |  |  |  |
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 1,300.0 |
6.750% notes, issued in September 2007 and due in August 2019 |  |  |  |  |  |
Debt |  |  |  |  |  |
Early repayment of notes payable |  |  |  |  | $ 550.0 |
Notes issued in March 2017 |  |  |  |  |  |
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 705.2

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