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Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions, $ in Millions |  |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2018 USD ($) | Mar. 13, 2018 USD ($) | Sep. 29, 2016 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 | Mar. 13, 2018 CAD ($) | Mar. 13, 2018 AUD ($) | Mar. 13, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 17, 2014 CAD ($) | Oct. 17, 2014 AUD ($) | Oct. 17, 2014 USD ($)
Term loan A | Base Rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
Secured letter of credit outside credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  | $ 500.0 |  |  |  |  |  |  |  |  |
2014 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity. |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio covenant |  |  |  | 5.00 |  | 4.75 |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  | 4.0 |  |  |  |  |  |  |  |
Consolidated interest coverage ratio |  |  |  |  | 4.7 |  |  |  |  |  |  |  |
2014 Credit Agreement | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 0.75% |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
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 | 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 | Term loan A |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  | $ 500 | $ 250 | $ 510.0 |  | $ 500 | $ 250 | $ 510.0
Borrowing capacity. |  |  |  | $ 185.0 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  | $ 600.0 |  |  |  | 600.0
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,350.0
Outstanding letters of credit |  | $ 64.2 |  |  | $ 64.2 |  |  |  |  | $ 58.1 |  |  |
Remaining borrowing capacity under credit facility |  | 1,159.0 |  |  | $ 1,159.0 |  |  |  |  | $ 991.9 |  |  |
2014 Credit Agreement | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity. |  | $ 1,350.0 | $ 1,050.0 |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio | 4.0 |  | 4.5 |  |  |  |  |  |  |  |  |  |

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