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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

X

- Definition

Represents the consolidated interest coverage ratio.

+ References

No definition available.

+ Details

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- Definition

Last day of any period, the ratio of Consolidated total debt on such day to the consolidated EBITDA for such period.

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- Definition

Ratio related to maximum consolidated leverage.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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