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Long-Term Debt Long-Term Debt Notes Payable (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 01, 2013 | Dec. 31, 2012 | Sep. 17, 2012 | Nov. 03, 2011 | Dec. 10, 2009 | Feb. 27, 2007
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  | $ 0.0 | $ 0.3 | $ 16.7 |  |  |  |  |  |
Repayments of Long-term Debt |  | 157.0 | 27.0 | 652.0 |  |  |  |  |  |
Other expense - Debt refinancing and redemption costs |  | $ 0.8 | $ 0.0 | 36.8 |  |  |  |  |  |
Secured Debt [Member] | 9.25% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  | $ 42.5 |  |  |  |
Debt Instrument, Original Discount Amount |  |  |  |  |  |  |  |  | $ 5.5 |
Repayments of Long-term Debt |  |  |  | 340.0 |  |  |  |  |  |
Debt instrument, early redemption premium |  |  |  | 18.9 |  |  |  |  |  |
Other expense - Debt refinancing and redemption costs |  |  |  | 6.7 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 425.0 |
Debt Instrument, Redemption Amount |  |  |  | 190.0 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.25% | 9.25% |  |  |  |  |  |  |
Unsecured Debt [Member] | 6.25% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | 6.6 |  |  |  |  |  |
Long-term debt |  | $ 400.0 | $ 400.0 | 400.0 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 5.125% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  | 0.2 | 3.1 |  |  |  |  |  |
Long-term debt |  | $ 200.0 | 200.0 | $ 200.0 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.125% |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 7.875% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  | $ 300.0 |  |  |  |  |
Debt instrument, early redemption premium | $ 8.5 |  |  |  |  |  |  |  |  |
Debt Instrument, Tender Offer, Fees | 0.1 |  |  |  |  |  |  |  |  |
Other expense - Debt refinancing and redemption costs | $ 2.1 |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 300.0
Debt Instrument, Interest Rate, Stated Percentage |  | 7.875% |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 7.75% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 200.0 | 200.0 |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 200.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.75% |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 6.625% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 550.0 | $ 550.0 |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 550.0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.625% |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 5.25% Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  | $ 250.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 0.00% |  |  |  |  |  |  |  |

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