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Debt, U.S. Senior Notes (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2020 | Feb. 20, 2020 | Sep. 11, 2019 | Sep. 10, 2019 | Jan. 09, 2019 | Jan. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Sep. 04, 2019 | Dec. 31, 2018
Debt |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 300,000 | $ 757,200,000 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | $ (14,300,000) |  |
Gain (loss) on extinguishment of debt, after tax |  |  |  |  |  |  |  |  | $ (12,500,000) |  |
Gain (loss) on extinguishment of debt, per diluted share |  |  |  |  |  |  |  |  | $ (0.04) |  |
Tender Offers [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Total consideration for debt tender offers |  |  | $ 368,800,000 |  |  |  |  |  |  |  |
Premiums paid on early extinguishment of debt |  |  | 13,400,000 |  |  |  |  |  |  |  |
U.S. Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  |  |  |  |  |  | 100.00% |  |  |  |
Debt instrument, covenant compliance |  |  |  |  |  |  | At March 31, 2020, the Company was in compliance with the financial covenants under its U.S. Senior Notes. |  |  |  |
2.20% Senior Notes due April 2020 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 2.20% |  | 2.20% |  |
2.20% Senior Notes due April 2020 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 2.20% |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |
2.55% Senior Notes due January 2019 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 2.55% |  |  |  |  | 2.55%
Repayments of long-term debt |  |  |  |  |  | $ 750,000,000.0 |  |  |  |  |
4.350% Senior Notes due June 2029 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  |  |  |  | 100.00% |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  | $ 500,000,000.0 |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.35% |  | 4.35% |  | 4.35% |  |
Debt instrument, face amount, net of discount (as a percent) |  |  |  |  | 99.904% |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  | Jun. 01, 2029 |  |  |  |
2.800% Senior Notes due February 2030 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  |  |  | 100.00% |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  | $ 900,000,000.0 |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 2.80% |  |  | 2.80% |  | 2.80% |  |
Debt instrument, face amount, net of discount (as a percent) |  |  |  | 99.92% |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  | Feb. 15, 2030 |  |  |  |
3.125% Senior Notes Due September 2021 and 4.00% Senior Notes due February 2022 [Member] | Tender Offers [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  | $ 3,100,000 |  |  |  |  |  |  |  |
3.125% Senior Notes due September 2021 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 3.125% |  | 3.125% |  |
3.125% Senior Notes due September 2021 | Tender Offers [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  |  | 101.90% |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  | $ 375,000,000.0 |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.125% |
Senior Note principal redeemed |  |  | $ 147,300,000 |  |  |  |  |  |  |  |
4.00% Senior Notes due February 2022 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 4.00% |  | 4.00% |  |
4.00% Senior Notes due February 2022 | Tender Offers [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  |  | 104.50% |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.00% |
Senior Note principal redeemed |  |  | $ 205,000,000.0 |  |  |  |  |  |  |  |
3.20% Senior Notes due April 2024 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 3.20% |  | 3.20% |  |
2.05% Senior Notes due March 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of principal amount |  | 100.00% |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.05% |  |  |  |  | 2.05% |  |  |  |
Debt instrument, face amount, net of discount (as a percent) |  | 99.829% |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  | Mar. 01, 2025 |  |  |  |

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