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Debt - Interest Paid on Debt (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Interest Paid | $ 44.1 | $ 45.7 | $ 37.7
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 4.8 | 15.0 | 15.0
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 21.6 | 21.6 | 21.6
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 5.2 | 0.0 | 0.0
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 11.1 | 8.5 | 0.0
Mortgage Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 0.0 | 0.0 | 0.3
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 1.4 | 0.6 | 0.8
Federal Home Loan Bank of Chicago [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 0.0 | 0.0 | 0.0
Federal Home Loan Bank of Dallas [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | $ 0.0 | $ 0.0 | $ 0.0

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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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