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Debt - Redemption Rates (Details)
12 Months Ended
Dec. 31, 2019
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Repurchase price in the event of change of control, percentage of principal plus accrued and unpaid interest 101.00%
Senior Notes 4.375 Percent due 2021 | Redemption date 2019  
Debt Instrument [Line Items]  
Redemption price, percentage 101.094%
Senior Notes 4.375 Percent due 2021 | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.375 Percent due 2021 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 6 Percent Due 2023 | Redemption date 2019  
Debt Instrument [Line Items]  
Redemption price, percentage 102.00%
Senior Notes 6 Percent Due 2023 | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 101.00%
Senior Notes 6 Percent Due 2023 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 6 Percent Due 2023 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 6 Percent Due 2023 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
CAD 5.375 Percent Senior Notes due 2023 | Redemption date 2019  
Debt Instrument [Line Items]  
Redemption price, percentage 104.031%
CAD 5.375 Percent Senior Notes due 2023 | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 102.688%
CAD 5.375 Percent Senior Notes due 2023 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 101.344%
CAD 5.375 Percent Senior Notes due 2023 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
CAD 5.375 Percent Senior Notes due 2023 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2019  
Debt Instrument [Line Items]  
Redemption price, percentage 100.958%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Subordinated Notes 5.75 Percent due 2024 | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Euro Notes 3 Percent due 2025 | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 101.50%
Euro Notes 3 Percent due 2025 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 100.75%
Euro Notes 3 Percent due 2025 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Euro Notes 3 Percent due 2025 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Euro Notes 3 Percent due 2025 | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Euro Notes 3 Percent due 2025 | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
GBP Notes due 2025 3.875 Percent | Redemption date 2020  
Debt Instrument [Line Items]  
Redemption price, percentage 101.938%
GBP Notes due 2025 3.875 Percent | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 100.969%
GBP Notes due 2025 3.875 Percent | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
GBP Notes due 2025 3.875 Percent | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
GBP Notes due 2025 3.875 Percent | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
GBP Notes due 2025 3.875 Percent | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 100000.00%
Senior Notes 5.375 Percent due 2026 | Redemption date 2021  
Debt Instrument [Line Items]  
Redemption price, percentage 102.688%
Senior Notes 5.375 Percent due 2026 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 101.792%
Senior Notes 5.375 Percent due 2026 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 100.896%
Senior Notes 5.375 Percent due 2026 | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 5.375 Percent due 2026 | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 5.375 Percent due 2026 | Redemption date 2026  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.875 Percent due 2027 | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 102.438%
Senior Notes 4.875 Percent due 2027 | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 101.625%
Senior Notes 4.875 Percent due 2027 | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.813%
Senior Notes 4.875 Percent due 2027 | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.875 Percent due 2027 | Redemption date 2026  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.875 Percent due 2027 | Redemption date 2027  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes due 2028 5.25 Percent | Redemption date 2022  
Debt Instrument [Line Items]  
Redemption price, percentage 102.625%
Senior Notes due 2028 5.25 Percent | Redemption date 2023  
Debt Instrument [Line Items]  
Redemption price, percentage 101.75%
Senior Notes due 2028 5.25 Percent | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 100.875%
Senior Notes due 2028 5.25 Percent | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes due 2028 5.25 Percent | Redemption date 2026  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes due 2028 5.25 Percent | Redemption date 2027  
Debt Instrument [Line Items]  
Redemption price, percentage 100000.00%
Senior Notes due 2028 5.25 Percent | Redemption date 2028  
Debt Instrument [Line Items]  
Redemption price, percentage 100000.00%
Senior Notes 4.875 Percent due 2029 | Redemption date 2024  
Debt Instrument [Line Items]  
Redemption price, percentage 102.438%
Senior Notes 4.875 Percent due 2029 | Redemption date 2025  
Debt Instrument [Line Items]  
Redemption price, percentage 101.609%
Senior Notes 4.875 Percent due 2029 | Redemption date 2026  
Debt Instrument [Line Items]  
Redemption price, percentage 100.814%
Senior Notes 4.875 Percent due 2029 | Redemption date 2027  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.875 Percent due 2029 | Redemption date 2028  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Senior Notes 4.875 Percent due 2029 | Redemption date 2029  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%