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Debt - 2014 Credit Agreement (Details) $ in Millions			3 Months Ended	6 Months Ended
	Sep. 29, 2016 USD ($)	Oct. 17, 2014 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017	Sep. 30, 2017 USD ($)
Secured letter of credit outside credit agreement
Debt agreements
Borrowing capacity	$ 500.0
2014 Credit Agreement
Debt agreements
Increase in borrowing capacity		$ 500.0
Maximum consolidated leverage ratio covenant	5.00			4.75
Consolidated leverage ratio			4.0
Consolidated interest coverage ratio			4.7
2014 Credit Agreement | Term loan A
Debt agreements
Borrowing capacity		1,925.0
Increase in borrowing capacity	$ 185.0
2014 Credit Agreement | Term loan B
Debt agreements
Borrowing capacity		760.0
2014 Credit Agreement | Revolving credit facility
Debt agreements
Borrowing capacity		$ 1,050.0
Outstanding letters of credit			$ 54.8		$ 58.1
Remaining borrowing capacity under credit facility			$ 915.2		$ 991.9

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- 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.

+ References

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- Definition

Ratio related to maximum consolidated leverage.

+ References

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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.

+ Details

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X

- 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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