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Long-Term Debt - Senior Notes Offering (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 16, 2018 USD ($) | Apr. 03, 2017 USD ($) | Feb. 13, 2017 EUR (€) | Feb. 13, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 CAD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 13, 2017 USD ($) | Sep. 09, 2013 USD ($)
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  | $ 0 | $ 1,789,200,000 | $ 0 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ (2,500,000) | $ (4,400,000) |  |  | $ (2,700,000) | $ (2,493,000) | (7,052,000) | $ 0 |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Redemption Price Percent If Change in Control Occurs |  |  | 101.00% |  |  |  |  |  |  |  |  |  | 101.00% |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 296,500,000 |  |  |  |  |  |  |  |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  | € 650,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption Price Percent If Change in Control Occurs |  |  | 101.00% |  |  |  |  |  |  |  |  |  | 101.00% |
Proceeds from Issuance of Long-term Debt | € |  |  | € 643,400,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Period - Post March 15 2020 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest |  |  | 102.375% | 102.375% |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Period - Post March 15 2020 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest |  |  | 101.625% | 101.625% |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Period - Post March 15 2022 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Ending, PLus Accrued and Unpaid Interest |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Period - Post March 15 2022 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Ending, PLus Accrued and Unpaid Interest |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption - Pre March 15 2020 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering |  |  | 35.00% |  |  |  |  |  |  |  |  |  | 35.00% |
Debt Redemption, Price Percent Of Principal Amount, From the Proceeds of Certain Equity Offerings |  |  | 104.75% |  |  |  |  |  |  |  |  |  | 104.75% |
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption - Pre March 15 2020 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Redemption, Price Percent Of Principal Amount, From the Proceeds of Certain Equity Offerings |  |  | 103.25% |  |  |  |  |  |  |  |  |  | 103.25% |
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One [Member] | Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium |  |  |  |  |  |  |  |  |  | 101.375% |  |  |  |
US Term Loan - 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | 212,300,000 |  |  |  |  |
Euro Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  |  |  |  |  | € 187,000,000 |  |  |  |  |  |  |
Other Foreign Bank Revolving And Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  |  |  |  |  | € 34,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Offering Price Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Offering Price Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |
Senior Notes [Member] | Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Debt Instrument Offering Price Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Redemption Price Percent If Change in Control Occurs |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00%
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium | 100.00% | 101.25% |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ (1,400,000) | $ (4,400,000) |  |  |  |  |  |  |  |
Early Repayment of Senior Debt | $ 280,000,000 | $ 220,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
US Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | $ 98,000,000 |  |  |  |  |
Canadian Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  | $ 14.0 |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  | $ (6,500,000) |  |  |

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