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Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 28, 2019 USD ($) | Sep. 30, 2019 CAD ($) | Sep. 30, 2019 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2019 CAD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | May 01, 2019 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  |  |  | $ 502.0 | $ 338.0 |  |
New borrowings |  |  |  |  |  |  |  | 4,558.0 | 174.0 |  |
Loss on early extinguishment of debt |  |  |  | $ (84.0) | $ (1.0) |  |  | (85.0) |  |  |
Net commercial borrowings (repayments) |  |  |  |  |  |  |  | (1,001.0) | $ 523.0 |  |
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Capital obligations | $ 140.0 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  |  | $ 15 | 11.0 |  |  |
Senior Notes, Aggregate [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | 4,000.0 |  |  |  |  |  |  |
New borrowings |  |  |  | 3,970.0 |  |  |  |  |  |  |
Amount of debt tendered, including interest |  |  |  | 344.0 |  |  |  |  |  |  |
Early extinguishment of high-coupon senior notes |  |  |  | 257.0 |  |  |  |  |  |  |
Accrued interest |  |  |  | 3.0 |  |  |  |  |  |  |
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.40% |  |  |  |  | 2.40% |  |  | 2.40% |
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 7.75% |  |  |  |  | 7.75% |  |  | 7.75% |
2.95% senior notes due June 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 750.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 2.95% |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |  |  |
3.20% senior notes due June 2026 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 750.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.20% |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |  |  |
3.45% senior notes due June 2029 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 1,000.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.45% |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |  |  |
4.00% senior notes due July 2039 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 500.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.00% |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |  |  |
4.15% senior notes due July 2049 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 1,000.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.15% |  |  |  |  |  |  |
7.10% senior notes due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 56.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 7.10% |  |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  |  |  |  |  | $ 304.0
7.00% senior notes due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 64.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 7.00% |  |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  |  |  |  |  | 395.0
7.375% senior notes due 2029 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 58.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 7.375% |  |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  |  |  |  |  | 139.0
7.75% senior notes due 2032 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 57.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 7.75% |  |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  |  |  |  |  | 210.0
6.125% senior notes due 2039 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 22.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 6.125% |  |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  |  |  |  |  | $ 274.0
Commercial Paper Program [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Net commercial borrowings (repayments) |  |  |  |  |  | $ 357.0 |  | 1,000.0 |  |  |
Canadian Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 500 |  |  |  |  | $ 500 |  |  | $ 377.0 |
Interest rate (as a percent) |  | 2.60% |  |  |  |  | 2.60% |  |  | 2.60% |
New borrowings |  | $ 496 | $ 373.0 |  |  |  |  |  |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  |  |  | 94.0 |  |  |
New borrowings |  |  |  |  |  |  |  | 115.0 |  |  |
Debt refunded and reissued |  |  |  |  |  |  |  |  |  | $ 99.0 |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.35% |  |  |  |  | 1.35% |  |  | 1.35% |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.30% |  |  |  |  | 4.30% |  |  | 4.30% |
Financing leases and other [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  |  |  | 37.0 |  |  |
Non-cash financing lease incurred |  |  |  |  |  |  |  | $ 122.0 |  |  |
Financing leases and other [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 9.00% |  |  |  |  | 9.00% |  |  | 9.00% |
Financing leases and other [Member] | Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Capital obligations | $ 140.0 |  |  |  |  |  |  |  |  |  |

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