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Fair Value Measurements, Equity Investments and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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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% |
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 | $ 3.0 | $ 8.8
Total debt | 3,702.1 | 3,726.7
Carrying Amount | Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 423.7 | 423.3
Carrying Amount | Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 423.3 | 422.9
Carrying Amount | Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 474.4 | 490.2
Carrying Amount | Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 422.5 | 422.1
Carrying Amount | Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 398.0 | 397.8
Carrying Amount | Senior Notes due December 2027 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 421.1 | 420.9
Carrying Amount | Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 446.1 | 446.0
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 | 474.8 | 474.7
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 | 215.2 | 220.0
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other foreign borrowings | 3.0 | 9.1
Total debt | 4,032.8 | 4,099.6
Fair Value | Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 442.5 | 446.0
Fair Value | Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 449.2 | 450.8
Fair Value | Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 514.0 | 537.5
Fair Value | Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 463.2 | 466.8
Fair Value | Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 446.2 | 446.7
Fair Value | Senior Notes due December 2027 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 451.2 | 453.6
Fair Value | Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 573.5 | 594.4
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 | 474.8 | 474.7
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 | $ 215.2 | $ 220.0

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