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Debt - Debt Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Notes Payable | $ 750.6 | $ 752.1
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Notes Payable | 0.0 | 249.5
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Notes Payable | 359.1 | 358.5
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Notes Payable | 247.4 | 0.0
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |
Debt Instrument [Line Items] |  |
Notes Payable | $ 144.1 | $ 144.1

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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