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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Jun. 30, 2018 USD ($)
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	$ 50.0
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, 2022	200.0
Contractual Obligations, Payments Due by Period, Thereafter	2,723.0
Contractual Obligations, Payments Due by Period, Total	3,248.0
Multi Currency Credit Agreement [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	135.0
Contractual Obligations, Payments Due by Period, Total	135.0
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	111.1
Contractual Obligations, Payments Due by Period, Total	111.1
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	70.4
Contractual Obligations, Payments Due by Period, 2019	137.4
Contractual Obligations, Payments Due by Period, 2020	132.7
Contractual Obligations, Payments Due by Period, 2021	127.9
Contractual Obligations, Payments Due by Period, 2022	122.4
Contractual Obligations, Payments Due by Period, Thereafter	557.6
Contractual Obligations, Payments Due by Period, Total	1,148.4
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	366.5
Contractual Obligations, Payments Due by Period, 2019	237.4
Contractual Obligations, Payments Due by Period, 2020	232.7
Contractual Obligations, Payments Due by Period, 2021	202.9
Contractual Obligations, Payments Due by Period, 2022	322.4
Contractual Obligations, Payments Due by Period, Thereafter	3,280.6
Contractual Obligations, Payments Due by Period, Total	4,642.5
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	54.7
Contractual Obligations, Payments Due by Period, 2019	100.1
Contractual Obligations, Payments Due by Period, 2020	85.6
Contractual Obligations, Payments Due by Period, 2021	73.3
Contractual Obligations, Payments Due by Period, 2022	57.3
Contractual Obligations, Payments Due by Period, Thereafter	144.9
Contractual Obligations, Payments Due by Period, Total	515.9
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	(0.8)
Contractual Obligations, Payments Due by Period, 2019	(0.8)
Contractual Obligations, Payments Due by Period, 2020	(0.6)
Contractual Obligations, Payments Due by Period, 2021	(0.6)
Contractual Obligations, Payments Due by Period, 2022	(0.4)
Contractual Obligations, Payments Due by Period, Thereafter	(1.2)
Contractual Obligations, Payments Due by Period, Total	(4.4)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	24.4
Contractual Obligations, Payments Due by Period, 2019	38.0
Contractual Obligations, Payments Due by Period, 2020	26.5
Contractual Obligations, Payments Due by Period, 2021	14.2
Contractual Obligations, Payments Due by Period, 2022	10.8
Contractual Obligations, Payments Due by Period, Thereafter	28.7
Contractual Obligations, Payments Due by Period, Total	142.6
Funding Related to Acquisition of Reassurance Holdings, Inc [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	122.1
Contractual Obligations, Payments Due by Period, Total	122.1
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2018	566.9
Contractual Obligations, Payments Due by Period, 2019	374.7
Contractual Obligations, Payments Due by Period, 2020	344.2
Contractual Obligations, Payments Due by Period, 2021	289.8
Contractual Obligations, Payments Due by Period, 2022	390.1
Contractual Obligations, Payments Due by Period, Thereafter	3,453.0
Contractual Obligations, Payments Due by Period, Total	$ 5,418.7

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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).

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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 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.

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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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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).

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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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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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