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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, 2019 | Dec. 31, 2018
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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 borrowings | $ 90.2 | $ 98.5
Other domestic borrowings | 165.0 | 168.4
Total debt(3) | 3,455.7 | 3,474.2
Carrying Amount | 6.50% Senior Notes due December 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 424.1 | 424.0
Carrying Amount | 4.875% Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 421.3 | 421.1
Carrying Amount | 5.25% Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 421.4 | 421.2
Carrying Amount | 4.50% Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 446.1 | 454.9
Carrying Amount | 5.125% Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 421.5 | 421.3
Carrying Amount | 5.50% Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 397.2 | 397.1
Carrying Amount | 6.875% Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 445.6 | 445.5
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 | 223.3 | 222.2
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other foreign borrowings | 90.3 | 99.2
Other domestic borrowings | 165.0 | 170.0
Total debt(3) | 3,648.1 | 3,535.1
Fair Value | 6.50% Senior Notes due December 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 444.0 | 440.1
Fair Value | 4.875% Senior Notes due December 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 437.3 | 421.2
Fair Value | 5.25% Senior Notes due April 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 441.3 | 424.5
Fair Value | 4.50% Senior Notes due September 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 499.1 | 489.9
Fair Value | 5.125% Senior Notes due December 2024 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 438.7 | 419.8
Fair Value | 5.50% Senior Notes due September 2025 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 421.4 | 394.8
Fair Value | 6.875% Senior Notes due July 2033 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes | 487.7 | 453.4
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 | $ 223.3 | $ 222.2

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