Debt Profile (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
2019	$ 620.7
2021	275.0
2023	572.7
Thereafter	767.0
Total long-term	1,614.7
Total	2,235.4	[1]
Eurobond
Debt Instrument [Line Items]
2023	572.7
Total long-term	572.7
Total	572.7
Commercial Papers
Debt Instrument [Line Items]
2019	342.6
Total	342.6
U.S. Private Placement Notes
Debt Instrument [Line Items]
2019	268.0
2021	275.0
Thereafter	767.0
Total long-term	1,042.0
Total	1,310.0
Other Short-term Debt.
Debt Instrument [Line Items]
2019	10.1
Total	$ 10.1

[1] The difference between reported total debt and total principal amount is mainly related to capitalized debt issuance costs.