Debt - Debt Outstanding Amounts Maturing (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Line Items]
Debt outstanding maturities 2014	$ 2.5
Debt outstanding maturities 2015	355.5
Debt outstanding maturities 2016	0.5
Debt outstanding maturities 2017	879.4
Debt outstanding maturities 2018	0.5
Debt outstanding maturities Thereafter	1,316.7
Total debt	2,555.1	2,457.4
Contractual Maturity
Debt Disclosure [Line Items]
Debt outstanding maturities 2014	0
Debt outstanding maturities 2015	350.0
Debt outstanding maturities 2016	0
Debt outstanding maturities 2017	878.9
Debt outstanding maturities 2018	0
Debt outstanding maturities Thereafter	1,304.7
Total debt	2,533.6
Capital Lease Obligations
Debt Disclosure [Line Items]
Debt outstanding maturities 2014	2.5
Debt outstanding maturities 2015	5.5
Debt outstanding maturities 2016	0.5
Debt outstanding maturities 2017	0.5
Debt outstanding maturities 2018	0.5
Debt outstanding maturities Thereafter	12.0
Total debt	$ 21.5