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Tender Offers and Open Market Repurchases (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 04, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Feb. 09, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 951.8 | $ 721.8 |  |  | $ 595.4 |  |  |  |
Debt Instrument, Repurchase Amount |  |  | 724.1 | 771.2 |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 3.1 | 194.1 | $ (19.0) |  |  |  |  |  |
Tender Offer |  |  |  | 985.0 |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  | 19.0 |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  | $ 311.2 | $ 1,093.1
Open Market Repurchases [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 12.8 |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ 9.7 |  |  |  |  |  |  |  |
4.70% Senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.70% |  |  |  |  |  |  |  |
4.70% Senior notes due 2021 | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | $ 156.2 | $ 413.3 | $ 12.8 |  | $ 156.2 |  | $ 817.0 |
Debt Instrument, Repurchase Amount |  |  |  |  |  | $ 9.7 |  | $ 159.7 |  |  |
Debt instrument interest rate stated percentage |  | 4.70% |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  | 2021 |  |  |  |  |  |  |  |  |
8.50% Senior notes due 2019(1) | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  | $ 55.0 |  | $ 237.6 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 256.8 |  |
Debt instrument interest rate stated percentage | 8.50% |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year | 2019 |  |  |  |  |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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