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Other Financial Statement Disclosures - Long Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt | $ 2,511.0 | $ 2,510.9
Current portion of long-term debt | 201.3 | 201.2
Long-term Debt, Excluding Current Maturities | 2,309.7 | 2,309.7
Subject Notes [Member] | 7.875% Senior Notes, due August 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 201.3 | $ 201.2
Stated rate | 7.875% | 7.875%
Principal amount | $ 201.4 | $ 201.4
Effective rate | 8.00% | 8.00%
Subject Notes [Member] | 4.875% Senior Notes, due June 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 623.5 | $ 623.8
Stated rate | 4.875% | 4.875%
Principal amount | $ 620.8 | $ 620.8
Effective rate | 4.70% | 4.70%
Subject Notes [Member] | 4.75% Senior Notes, due January 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 396.4 | $ 396.3
Stated rate | 4.75% | 4.75%
Principal amount | $ 398.1 | $ 398.1
Effective rate | 4.80% | 4.80%
Subject Notes [Member] | 7.375% Senior Note Payable Due June 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 497.9 | $ 497.8
Stated rate | 7.375% | 7.375%
Principal amount | $ 500.0 | $ 500.0
Effective rate | 7.40% | 7.40%
Subject Notes [Member] | 5.4% Senior Notes due, December 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 395.4 | $ 395.3
Stated rate | 5.40% | 5.40%
Principal amount | $ 400.0 | $ 400.0
Effective rate | 5.40% | 5.40%
Subject Notes [Member] | 5.85% Senior Notes, due January 2044 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 396.5 | $ 396.5
Stated rate | 5.85% | 5.85%
Principal amount | $ 400.0 | $ 400.0
Effective rate | 5.90% | 5.90%

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