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Debt - Interest Expense on Debt (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | $ 45.3 | $ 47.3 | $ 47.9
Capitalization of Interest | (0.9) | (0.8) | (1.0)
Total Interest Expense | 44.4 | 46.5 | 46.9
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 0.0 | 3.7 | 15.5
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 22.3 | 22.2 | 22.2
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 11.1 | 9.5 | 0.0
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 11.1 | 11.1 | 9.4
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 0.8 | 0.8 | 0.8
Federal Home Loan Bank of Chicago [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 0.0 | 0.0 | 0.0
Federal Home Loan Bank of Dallas [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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