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Long Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total principal debt	$ 980.6	$ 851.9
Unamortized debt discount	(2.5)	(2.5)
Total	978.1	849.4
Senior debentures maturing June 15, 2021
Debt Instrument [Line Items]
Total principal debt	300.0	300.0
Senior debentures maturing March 1, 2020
Debt Instrument [Line Items]
Total principal debt	200.0	200.0
Senior debentures maturing October 15, 2025
Debt Instrument [Line Items]
Total principal debt	120.9	120.9
Subordinated debentures maturing March 30, 2053
Debt Instrument [Line Items]
Total principal debt	175.0
Subordinated debentures maturing February 3, 2027
Debt Instrument [Line Items]
Total principal debt	59.7	59.7
Federal Home Loan Bank of Boston
Debt Instrument [Line Items]
Total principal debt	$ 125.0	$ 171.3

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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