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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Values of Financial Instruments |  |
Total | $ 1,945.0 | $ 1,942.1
Senior Unsecured Notes |  |
Fair Values of Financial Instruments |  |
Carrying value, before deducting unamortized discount or premiums | 750.0 | 1,100.0
Carrying value | 743.2 | 1,090.0
Senior Unsecured Notes | Level 2 |  |
Fair Values of Financial Instruments |  |
Fair value | $ 773.2 | $ 1,080.0

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