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v2.4.1.9

Changes in Preferred Stock, Common Stock and Treasury Stock (Detail) In Millions, unless otherwise specified | 25 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Option Activity And Changes [Line Items] |  |  |  |  |
Common stock repurchases | 2.2 us-gaap_TreasuryStockSharesAcquired |  |  |  |
Preferred Stock |  |  |  |  |
Stock Option Activity And Changes [Line Items] |  |  |  |  |
Beginning Balance |  | 2.6 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  | 2.6 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred stock conversion |  | (2.6)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |
Ending Balance |  |  |  | 2.6 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 2.6 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Common Stock |  |  |  |  |
Stock Option Activity And Changes [Line Items] |  |  |  |  |
Beginning Balance |  | 45.1 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 44.3 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 43.8 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Stock-based compensation |  | 0.4 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0.8 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0.5 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Preferred stock conversion |  | 6.9 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Ending Balance | 52.4 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 52.4 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45.1 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 44.3 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Treasury Stock |  |  |  |  |
Stock Option Activity And Changes [Line Items] |  |  |  |  |
Beginning Balance |  | 1.1 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0.4 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0.3 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Common stock repurchases |  | 1.6 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0.6 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock-based compensation |  |  | 0.1 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0.1 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Ending Balance | 2.7 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2.7 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1.1 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0.4 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |

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