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Principal Payments Due on Long-Term Borrowings (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
2016
2017 $ 300.0
2018
2019 $ 450.0
2020 500.0
Thereafter 2,143.1
Total long-term debt 3,393.1
Series 2007-1 Notes [Member]  
Debt Instrument [Line Items]  
2017 300.0
Total long-term debt 300.0
2010 Senior Notes [Member]  
Debt Instrument [Line Items]  
2020 500.0
Total long-term debt 500.0
2012 Senior Notes [Member]  
Debt Instrument [Line Items]  
Thereafter 500.0
Total long-term debt 500.0
2013 Senior Notes [Member]  
Debt Instrument [Line Items]  
Thereafter 500.0
Total long-term debt 500.0
2014 Senior Notes (5-Year) [Member]  
Debt Instrument [Line Items]  
2019 450.0
Total long-term debt 450.0
2014 Senior Notes (30-Year) [Member]  
Debt Instrument [Line Items]  
Thereafter 600.0
Total long-term debt 600.0
2015 Senior Notes [Member]  
Debt Instrument [Line Items]  
Thereafter 543.1
Total long-term debt $ 543.1