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Notes Payable - Interest Paid 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 Paid | $ 37.7 | $ 39.3 | $ 38.4
Notes Payable under Revolving Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 0.8 | 2.3 | 1.2
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, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 15.0 | 15.0 | 15.2
Mortgage Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | $ 0.3 | $ 0.4 | $ 0.4

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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=31042434&loc=d3e3536-108585 + Details
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