Long-Term Obligations and Other Short-Term Borrowings - Long-Term Obligations, Presented Net of Issue Discounts and Fees Paid to Lenders, and Other Short-Term Borrowings (Detail) € in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Nov. 07, 2017	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 18, 2017 USD ($)	Sep. 18, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 09, 2016 EUR (€)
Schedule Of Debt [Line Items]
Bridge Loan					$ 700.0
Prepaid expenses and other		$ 124.2				$ 97.8
Debt, Current		23.9				24.6
Long-term Debt and Capital Lease Obligations		2,082.9				2,055.1
Repayments of Long-term Debt		4.7	$ 4.7
Bridge Loan [Member]
Schedule Of Debt [Line Items]
Prepaid expenses and other		6.1
Term Loan Three Facility Dollar Denominated [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations		1,241.1				1,244.2
Term Loan Three Facility Euro Denominated [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations		365.2				352.0
Four Point Seven Five Percent Senior Euro Denominated Notes [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations | €							€ 380.0
Debt Instrument, Interest Rate, Stated Percentage							4.75%
Capital Lease Obligations [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations		53.9				53.3
Other Obligations [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations		$ 5.0				$ 5.9
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Dollar Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.75%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Euro Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Subsequent Event [Member]
Schedule Of Debt [Line Items]
Fair Value Inputs, Prepayment Rate	1.00%
Subsequent Event [Member] | U.S. Dollar-denominated 4.875% Senior Notes [Member]
Schedule Of Debt [Line Items]
Debt and Capital Lease Obligations				$ 450.0
Debt Instrument, Interest Rate, Stated Percentage				4.88%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Dollar Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Debt Instrument, Interest Rate, Increase (Decrease)	(0.50%)
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Euro Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt Instrument, Interest Rate, Increase (Decrease)	(0.75%)
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility - Two [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)	(1.25%)
Maximum [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility - Two [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Dollar Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.00%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Three Facility Euro Denominated [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.00%
Minimum [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility - Two [Member]
Schedule Of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%