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Debt and Finance Lease Obligations (Senior Notes) (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2020 | Sep. 14, 2020 USD ($) | Dec. 31, 2019 | Mar. 17, 2015 EUR (€) | Nov. 01, 2013 USD ($) | Sep. 11, 2012 USD ($)
2030 USD Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 500,000,000.0 |  |  |  |
Interest rate (as a percentage) |  | 3.50% | 3.50% | 3.50% |  |  |
Price of senior notes, stated as percentage of principal amount |  |  | 99.656% |  |  |  |
Basis points increase over Treasury Rate upon redemption |  | 0.0045 |  |  |  |  |
2022 EUR Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  | € 500,000,000.0 |  |
Interest rate (as a percentage) |  | 1.25% |  | 1.25% | 1.25% |  |
Price of senior notes, stated as percentage of principal amount |  |  |  |  | 99.336% |  |
Proceeds from (Repayments of) Long-term Debt and Capital Securities | $ 191,400,000 |  |  |  |  |  |
Loss on extinguishment | $ 1,200,000 |  |  |  |  |  |
Redemption price, states as percentage of principal amount |  | 100.00% |  |  |  |  |
Basis points increase over Treasury Rate upon redemption |  | 0.0025 |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 100.00% |  |  |  |  |
2023 Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 300,000,000.0 |
Interest rate (as a percentage) |  | 4.00% |  | 4.00% |  | 4.00% |
Price of senior notes, stated as percentage of principal amount |  |  |  |  |  | 99.532% |
Basis points increase over Treasury Rate upon redemption |  | 0.0025 |  |  |  |  |
2022 Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 500,000,000.0
Interest rate (as a percentage) |  | 3.50% |  | 3.50% |  |  | 3.50%
Price of senior notes, stated as percentage of principal amount |  |  |  |  |  |  | 99.615%
Redemption price, states as percentage of principal amount |  | 100.00% |  |  |  |  |
Basis points increase over Treasury Rate upon redemption |  | 0.0030 |  |  |  |  |

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