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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in marketable equity securities | $ 0.0 | $ 4.1
Quoted Prices in Active Markets for Identical Assets (Level 2) [Member] | Senior Unsecured Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior unsecured notes | $ 302.9 | $ 308.1

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