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Tender Offers and Open Market Repurchases (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2014 | Dec. 31, 2012 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 04, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 12.8 |  |  |  | $ 951.8 | $ 951.8 |  |
Debt Instrument, Repurchase Amount | 9.7 |  |  |  | 724.1 | 724.1 |  |
Gain (Loss) on Extinguishment of Debt | $ 3.1 |  |  | $ 0.0 | $ 0.0 | $ 3.1 | $ 194.1 |
Long-term Debt |  |  |  | $ 544.8 |  |  |  |
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 |  |  |  |  |  |  |  | $ 12.8
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | $ 9.7
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 interest rate stated percentage |  | 8.50% |  |  |  |  |  |
Senior Note Maturity Year |  | 2019 |  |  |  |  |  |

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