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Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |
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Feb. 08, 2021 USD ($) | Jul. 30, 2020 USD ($) | May 01, 2020 USD ($) | Jul. 01, 2018 | Mar. 13, 2018 USD ($) | Oct. 17, 2014 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Oct. 01, 2019 | Mar. 13, 2018 CAD ($) | Mar. 13, 2018 AUD ($) | Mar. 31, 2017 | Sep. 29, 2016 USD ($) | Oct. 17, 2014 CAD ($) | Oct. 17, 2014 AUD ($)
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from secured delayed draw term loan facility |  | $ 248,500,000 |  |  |  |  | $ 409,710,000 | $ 1,810,509,000 |  |  |  |  |  |  |  |
Term loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,000,000.0 |  |
Revolving credit facility | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  | 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Subject to increase leverage ratio |  |  | 4.50 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  |  |  | 2.3 |  |  |  |  |  |  |  |  |
Consolidated interest coverage ratio |  |  |  |  |  |  | 6.2 |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Base Rate | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | LIBOR | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated interest coverage ratio | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Minimum | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio | 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated interest coverage ratio | 3.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Maximum | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 510,000,000 | $ 510,000,000 |  |  |  |  | $ 500 | $ 250 |  |  | $ 500 | $ 250
2014 Credit Agreement | Term loan A | Base Rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan A | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 600,000,000 | 600,000,000 |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan B | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan B | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  | $ 1,329,400,000 |  | $ 1,331,000,000.0 |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  | $ 1,350,000,000 | $ 1,050,000,000.00 |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  | $ 20,600,000 |  | $ 19,000,000.0 |  |  |  |  |  |  |
2014 Credit Agreement | Revolving credit facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Revolving credit facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Revolving credit facility | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Consolidated leverage ratio |  |  |  |  | 4.5 |  |  |  |  | 4.0 | 4.5 | 4.5 | 4.75 | 5.00 |  |

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