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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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6.50% Senior Notes due December 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 6.50% |
4.875% Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 4.875% |
5.25% Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 5.25% |
4.50% Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 4.50% |
5.125% Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 5.125% |
5.50% Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt interest rate | 5.50% |
6.875% 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 loans | $ 162.3 | $ 30.2
Other domestic loans | 1.3 | 3.6
Total debt | 3,405.2 | 3,258.0
Carrying Amount | 6.50% Senior Notes due December 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 423.7 | 423.6
Carrying Amount | 4.875% Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 420.6 | 420.4
Carrying Amount | 5.25% Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 420.6 | 420.4
Carrying Amount | 4.50% Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 488.7 | 474.3
Carrying Amount | 5.125% Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 420.9 | 420.7
Carrying Amount | 5.50% Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 396.7 | 396.7
Carrying Amount | 6.875% Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 445.4 | 445.4
Carrying Amount | Term Loan A Facility due July 2019 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Term Loan A Facility | 225.0 | 222.7
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other foreign loans | 161.3 | 30.4
Other domestic loans | 1.4 | 3.6
Total debt | 3,618.0 | 3,596.2
Fair Value | 6.50% Senior Notes due December 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 452.7 | 465.1
Fair Value | 4.875% Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 431.8 | 451.0
Fair Value | 5.25% Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 437.9 | 455.6
Fair Value | 4.50% Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 549.4 | 544.4
Fair Value | 5.125% Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 434.4 | 456.2
Fair Value | 5.50% Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 417.9 | 439.9
Fair Value | 6.875% Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 506.2 | 527.3
Fair Value | Term Loan A Facility due July 2019 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Term Loan A Facility | $ 225.0 | $ 222.7

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