Debt - Future Maturities Of Debt (Detail) $ in Millions	Dec. 31, 2016 USD ($)
Long Term Debt Maturities
2017	$ 8.2
2018	0.2
2019	172.2
2020	350.0
2021	716.0
2022 and thereafter	1,159.0
Total	$ 2,405.6	[1]

[1] Excludes unamortized debt issuance costs of $16.5 million and $1.7 million of bond discount which do not represent contractual commitments with a fixed amount or maturity date.