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Debt - Debt Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2017 - $614.6; 2016 - $770.9) | $ 592.3 | $ 751.6
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2017 - $614.6; 2016 - $770.9) | 0.0 | 359.8
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2017 - $614.6; 2016 - $770.9) | 448.1 | 247.7
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2017 - $614.6; 2016 - $770.9) | $ 144.2 | $ 144.1

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