|
Borrowing Arrangements (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | 1 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Dec. 31, 2012
Senior Notes
Senior Notes 2017
|
Dec. 31, 2012
Senior Notes
Senior Notes 2022
|
Dec. 31, 2012
Senior Notes
|
Jan. 31, 2014
Senior Notes
|
|
| Debt Disclosure [Line Items] | ||||||
| Debt Instrument, Face Amount | $ 400.0 | $ 350.0 | ||||
| Debt Instrument, Interest Rate, Stated Percentage | 1.95% | 3.60% | ||||
| Debt Instrument, Maturity Date | Dec. 15, 2017 | Dec. 15, 2022 | ||||
| Proceeds from Debt, Net of Issuance Costs | 739.3 | |||||
| Debt Instrument, Unamortized Discount | 4.5 | |||||
| Debt Issuance Cost | 6.1 | |||||
| Debt redemption percentage of principle amount (as a percent) | 101.00% | |||||
| Debt Instrument, Fair Value Disclosure | 738.0 | |||||
| Unsecured revolving credit facility | 400.0 | |||||
| Unsecured revolving credit facility, option to request an increase in the amount of the credit facility up to | 100.0 | |||||
| Line of credit facility, expiration | May 31, 2018 | |||||
| Line of credit facility, outstanding borrowings | $ 0 | $ 0 | ||||