Derivative Instruments And Hedging Activities - Additional Information (Detail) € in Millions, $ in Millions	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Aug. 10, 2017 EUR (€)
Foreign Exchange Option [Member] | Cross-Currency Received [Member] | Bureau Van Dijk [Member] | Call Option [Member]
Derivative [Line Items]
Notional amount			€ 2,700.0
Foreign Exchange Option [Member] | Cross-Currency Received [Member] | Bureau Van Dijk [Member] | Put Option [Member]
Derivative [Line Items]
Notional amount			€ 2,700.0
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Paid [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount | $		$ 110.5
Derivative, swaption interest rate	3.945%	3.945%
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Received [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount	€ 100.0
Derivative, swaption interest rate	1.75%	1.75%
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Paid [Member]
Derivative [Line Items]
Notional amount | $		$ 580.0
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Paid [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount	€ 500.0
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Received [Member]
Derivative [Line Items]
Notional amount	490.1
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Received [Member] | 2021 [Member]
Derivative [Line Items]
Notional amount	422.5
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Cross-Currency Received [Member] | 2022 [Member]
Derivative [Line Items]
Notional amount	€ 67.6