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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	$ 100.0
Contractual Obligations, Payments Due by Period, 2019	100.0
Contractual Obligations, Payments Due by Period, 2020	100.0
Contractual Obligations, Payments Due by Period, 2021	75.0
Contractual Obligations, Payments Due by Period, Thereafter	2,423.0
Contractual Obligations, Payments Due by Period, Total	2,798.0
Multi Currency Credit Agreement [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	75.0
Contractual Obligations, Payments Due by Period, Total	75.0
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	156.4
Contractual Obligations, Payments Due by Period, Total	156.4
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	34.3
Contractual Obligations, Payments Due by Period, 2018	119.8
Contractual Obligations, Payments Due by Period, 2019	115.1
Contractual Obligations, Payments Due by Period, 2020	110.7
Contractual Obligations, Payments Due by Period, 2021	105.7
Contractual Obligations, Payments Due by Period, Thereafter	468.7
Contractual Obligations, Payments Due by Period, Total	954.3
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	265.7
Contractual Obligations, Payments Due by Period, 2018	219.8
Contractual Obligations, Payments Due by Period, 2019	215.1
Contractual Obligations, Payments Due by Period, 2020	210.7
Contractual Obligations, Payments Due by Period, 2021	180.7
Contractual Obligations, Payments Due by Period, Thereafter	2,891.7
Contractual Obligations, Payments Due by Period, Total	3,983.7
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	28.9
Contractual Obligations, Payments Due by Period, 2018	101.4
Contractual Obligations, Payments Due by Period, 2019	85.7
Contractual Obligations, Payments Due by Period, 2020	70.5
Contractual Obligations, Payments Due by Period, 2021	58.6
Contractual Obligations, Payments Due by Period, Thereafter	141.3
Contractual Obligations, Payments Due by Period, Total	486.4
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	(0.7)
Contractual Obligations, Payments Due by Period, 2018	(0.4)
Contractual Obligations, Payments Due by Period, 2019	(0.1)
Contractual Obligations, Payments Due by Period, 2020	(0.1)
Contractual Obligations, Payments Due by Period, Total	(1.3)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	19.2
Contractual Obligations, Payments Due by Period, 2018	35.9
Contractual Obligations, Payments Due by Period, 2019	19.2
Contractual Obligations, Payments Due by Period, 2020	7.7
Contractual Obligations, Payments Due by Period, 2021	2.2
Contractual Obligations, Payments Due by Period, Total	84.2
Funding Related to Acquistion of DiBrina Group [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	42.8
Contractual Obligations, Payments Due by Period, Total	42.8
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2017	355.9
Contractual Obligations, Payments Due by Period, 2018	356.7
Contractual Obligations, Payments Due by Period, 2019	319.9
Contractual Obligations, Payments Due by Period, 2020	288.8
Contractual Obligations, Payments Due by Period, 2021	241.5
Contractual Obligations, Payments Due by Period, Thereafter	3,033.0
Contractual Obligations, Payments Due by Period, Total	$ 4,595.8

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- Definition

Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]

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- Definition

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
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Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of the recorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
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Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Name Accounting Standards Codification
-Topic 440
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Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308

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Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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