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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Mar. 31, 2019 USD ($)
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
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, 2022	200.0
Contractual Obligations, Payments Due by Period, 2023	300.0
Contractual Obligations, Payments Due by Period, Thereafter	3,023.0
Contractual Obligations, Payments Due by Period, Total	3,798.0
Multi Currency Credit Agreement [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	260.0
Contractual Obligations, Payments Due by Period, Total	260.0
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	134.8
Contractual Obligations, Payments Due by Period, Total	134.8
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	126.1
Contractual Obligations, Payments Due by Period, 2020	163.1
Contractual Obligations, Payments Due by Period, 2021	157.9
Contractual Obligations, Payments Due by Period, 2022	152.6
Contractual Obligations, Payments Due by Period, 2023	142.9
Contractual Obligations, Payments Due by Period, Thereafter	616.6
Contractual Obligations, Payments Due by Period, Total	1,359.2
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	620.9
Contractual Obligations, Payments Due by Period, 2020	263.1
Contractual Obligations, Payments Due by Period, 2021	232.9
Contractual Obligations, Payments Due by Period, 2022	352.6
Contractual Obligations, Payments Due by Period, 2023	442.9
Contractual Obligations, Payments Due by Period, Thereafter	3,639.6
Contractual Obligations, Payments Due by Period, Total	5,552.0
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	79.7
Contractual Obligations, Payments Due by Period, 2020	93.0
Contractual Obligations, Payments Due by Period, 2021	79.4
Contractual Obligations, Payments Due by Period, 2022	61.6
Contractual Obligations, Payments Due by Period, 2023	48.3
Contractual Obligations, Payments Due by Period, Thereafter	94.2
Contractual Obligations, Payments Due by Period, Total	456.2
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	(0.9)
Contractual Obligations, Payments Due by Period, 2020	(0.7)
Contractual Obligations, Payments Due by Period, 2021	(0.7)
Contractual Obligations, Payments Due by Period, 2022	(0.3)
Contractual Obligations, Payments Due by Period, 2023	(0.3)
Contractual Obligations, Payments Due by Period, Thereafter	(0.9)
Contractual Obligations, Payments Due by Period, Total	(3.8)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	41.0
Contractual Obligations, Payments Due by Period, 2020	37.9
Contractual Obligations, Payments Due by Period, 2021	29.5
Contractual Obligations, Payments Due by Period, 2022	14.2
Contractual Obligations, Payments Due by Period, 2023	7.9
Contractual Obligations, Payments Due by Period, Thereafter	23.1
Contractual Obligations, Payments Due by Period, Total	153.6
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2019	740.7
Contractual Obligations, Payments Due by Period, 2020	393.3
Contractual Obligations, Payments Due by Period, 2021	341.1
Contractual Obligations, Payments Due by Period, 2022	428.1
Contractual Obligations, Payments Due by Period, 2023	498.8
Contractual Obligations, Payments Due by Period, Thereafter	3,756.0
Contractual Obligations, Payments Due by Period, Total	$ 6,158.0

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- Definition

Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]

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Amount of the recorded obligation, sublease agreement, 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

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Amount of the recorded unconditional purchase obligation sublease 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.

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Amount of the recorded unconditional purchase obligation sublease 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.

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Amount of the recorded unconditional purchase obligation sublease 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.

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Amount of the recorded unconditional purchase obligation sublease maturing in the remainder 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.

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Amount of the recorded unconditional purchase obligation, sublease 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.

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No definition available.

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Amount of the recorded unconditional purchase obligation, sublease 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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-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.

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-Section 50
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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.

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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.

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