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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, 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 borrowings | $ 154.2 | $ 30.2
Other domestic borrowings | 186.4 | 3.6
Total debt | 3,555.9 | 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 | 423.9 | 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 | 420.9 | 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 | 421.0 | 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 | 462.6 | 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 | 421.2 | 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 | 397.0 | 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 | 445.5 | 445.4
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 | 223.2 | 222.7
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other foreign borrowings | 153.0 | 30.4
Other domestic borrowings | 186.6 | 3.6
Total debt | 3,714.8 | 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 | 447.1 | 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 | 429.1 | 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 | 431.9 | 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 | 523.2 | 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 | 427.7 | 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 | 407.3 | 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 | 485.7 | 527.3
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 | $ 223.2 | $ 222.7

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