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Long-Term Debt Senior Notes Offering (Details) CAD in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 USD ($) | Feb. 13, 2017 EUR (€) | Feb. 13, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 CAD | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Feb. 13, 2017 USD ($) | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | $ 1,789,200,000 | $ 0 |  |
Loss on early extinguishment of debt |  |  |  | $ 0 |  |  |  | $ 0 | $ 7,052,000 | $ 0 |  |
Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 5.50% |  |  |  | 5.50% | 5.50% | 5.50% |  | 5.50%
Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 4.75% |  |  |  |  | 4.75% |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Redemption Price Percent If Change in Control Occurs Plus Accrued and Unpaid Interest |  | 101.00% |  |  |  |  |  |  |  |  | 101.00% |
Proceeds from Issuance of Long-term Debt |  |  | $ 296,500,000 |  |  |  |  |  |  |  |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] | Debt Instrument Redemption Period - Post March 15 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest |  | 102.375% | 102.375% |  |  |  |  |  |  |  |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] | Debt Instrument Redemption Period - Post March 15 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Ending, Plus Accrued and Unpaid Interest |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] | Debt Instrument, Redemption - Pre March 15 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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, Plus Accrued and Unpaid Interest |  | 104.75% |  |  |  |  |  |  |  |  | 104.75% |
Debt redemption price percent of principle amount in addition to a make-whole premium |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 3.25% |  |  |  |  | 3.25% |  |  |
Debt Instrument, Face Amount | € |  | € 650,000,000 |  |  |  |  |  |  |  |  |  |
Redemption Price Percent If Change in Control Occurs Plus Accrued and Unpaid Interest |  | 101.00% |  |  |  |  |  |  |  |  | 101.00% |
Proceeds from Issuance of Long-term Debt | € |  | € 643,400,000 |  |  |  |  |  |  |  |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] | Debt Instrument Redemption Period - Post March 15 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest |  | 101.625% | 101.625% |  |  |  |  |  |  |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] | Debt Instrument Redemption Period - Post March 15 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage, Ending, Plus Accrued and Unpaid Interest |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] | Debt Instrument, Redemption - Pre March 15 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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, Plus Accrued and Unpaid Interest |  | 103.25% |  |  |  |  |  |  |  |  | 103.25% |
Debt redemption price percent of principle amount in addition to a make-whole premium |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 5.00% |  |  |  | 5.00% | 5.00% | 5.00% |  | 5.00%
Euro Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  |  |  | € 187,000,000 |  |  |  |  |  |  |
Other Foreign Bank Revolving And Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  |  |  | € 34,000,000 |  |  |  |  |  |  |
Canadian Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | CAD |  |  |  |  |  | CAD 14.0 |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |
Senior Notes [Member] | Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 5.50% |  |  |  |  | 5.50% |  |  |
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior note interest rate (percent) |  |  |  | 5.00% |  |  |  |  | 5.00% |  |  |
Debt redemption price percent of principle amount in addition to a make-whole premium | 101.25% |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | $ 4,400,000 |  |  |
Early Repayment of Senior Debt | $ 220,000,000.0 |  |  |  |  |  |  |  |  |  |  |
US Term Loan - 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 212,300,000 |  |  |  |  |
US Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 98,000,000 |  |  |  |  |

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