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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Nov. 26, 2019
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Senior Notes due December 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 4.875% |  |
Senior Notes due April 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 5.25% |  |
Senior Notes due September 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 4.50% |  |
Senior Notes due December 2024 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 5.125% |  |
Senior Notes due September 2025 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 5.50% |  |
Senior Notes due December 2027 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 4.00% |  | 4.00%
Senior Notes due July 2033 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Debt interest rate | 6.875% |  |
Carrying Amount |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Other foreign borrowings | $ 9.0 | $ 12.1 |
Other domestic borrowings | 0.0 | 89.0 |
Total debt | 3,703.9 | 3,774.4 |
Carrying Amount | Senior Notes due December 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 422.6 | 421.9 |
Carrying Amount | Senior Notes due April 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 422.7 | 422.0 |
Carrying Amount | Senior Notes due September 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 467.9 | 445.6 |
Carrying Amount | Senior Notes due December 2024 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 422.4 | 421.9 |
Carrying Amount | Senior Notes due September 2025 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 397.7 | 397.4 |
Carrying Amount | Senior Notes due December 2027 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 420.7 | 420.4 |
Carrying Amount | Senior Notes due July 2033 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 445.8 | 445.7 |
Carrying Amount | Term Loan A due August 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Term Loan A Facility | 474.6 | 474.6 |
Carrying Amount | Term Loan A due July 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Term Loan A Facility | 220.5 | 223.8 |
Fair Value |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Other foreign borrowings | 9.2 | 12.4 |
Other domestic borrowings | 0.0 | 89.0 |
Total debt | 4,030.2 | 4,073.9 |
Fair Value | Senior Notes due December 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 443.8 | 450.1 |
Fair Value | Senior Notes due April 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 448.5 | 454.1 |
Fair Value | Senior Notes due September 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 510.6 | 509.5 |
Fair Value | Senior Notes due December 2024 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 460.8 | 458.9 |
Fair Value | Senior Notes due September 2025 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 444.7 | 441.2 |
Fair Value | Senior Notes due December 2027 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 443.4 | 431.5 |
Fair Value | Senior Notes due July 2033 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Senior Notes | 574.1 | 528.8 |
Fair Value | Term Loan A due August 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Term Loan A Facility | 474.6 | 474.6 |
Fair Value | Term Loan A due July 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Term Loan A Facility | $ 220.5 | $ 223.8 |

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