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Notes Payable - Interest Expense on Notes Payable (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | $ 39.2 | $ 39.8 | $ 39.8
Capitalization of Interest | (0.9) | (1.8) | (2.5)
Total Interest Expense | 38.3 | 38.0 | 37.3
Notes Payable under Revolving Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 1.4 | 1.9 | 2.0
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 22.2 | 22.1 | 22.0
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 15.4 | 15.4 | 15.4
Mortgage Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | $ 0.2 | $ 0.4 | $ 0.4

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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