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Other Debt Disclosures Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 0.0 | $ 10.6 |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  | 5.90% |  | 5.80% |
Proceeds from issuance of long-term debt |  |  |  | $ 22.8 | $ 408.8 |  |
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.25% |  |  |
Long-term Debt |  |  |  | $ 700.0 |  | $ 700.0 |
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | $ 100.0 |  |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 1.8 |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost | 1.4 |  |  |  |  |  |
Redemption Premium | $ 3.1 |  |  |  |  |  |
Unsecured Debt [Member] | 6.875% Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.875% |  |  | 6.875% |  |
Long-term Debt |  |  |  | 400.0 |  | 400.0 |
Payments of Debt Issuance Costs |  |  |  |  | $ 6.0 |  |
Proceeds from issuance of long-term debt |  | $ 400.0 |  |  |  |  |
Unsecured Debt [Member] | 6.625% Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.625% |  |  |  | 6.625%
Debt Instrument, Repurchase Amount |  |  | $ 100.0 |  |  |  | $ 350.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities |  |  | 2.0 |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  | 0.4 |  |  |  |
Redemption Premium |  |  | $ 1.1 |  |  |  |
Foreign Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | 108.7 |  | $ 88.8 |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  | $ 60.7 |  |  |

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