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Subsequent Event-Stock Split (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Earnings per share |  |  |  |  |
Basic - as reported (pre-stock split) (in dollars per share) |  | $ 0.42 | $ 0.17 | $ 0.63 | $ 0.26
Diluted - as reported (pre-stock split) (in dollars per share) |  | $ 0.42 | $ 0.17 | $ 0.62 | $ 0.26
Weighted-average shares outstanding |  |  |  |  |
Basic - as reported (pre-stock split) (in shares) |  | 210,349,000 | 209,512,000 | 210,250,000 | 209,320,000
Diluted - as reported (pre-stock split) (in shares) |  | 211,745,000 | 211,158,000 | 211,492,000 | 210,974,000
Subsequent event |  |  |  |  |
Subsequent event-stock split |  |  |  |  |
Stock split ratio declared by the Board of Directors | 2 |  |  |  |
Reduction in additional paid-in capital due to pro forma effect |  |  |  | $ 21.1 |
Increase in common shares outstanding due to pro forma effect |  |  |  | 21,100,000 |
Earnings per share |  |  |  |  |
Basic - as reported (pre-stock split) (in dollars per share) |  | $ 0.42 | $ 0.17 | $ 0.63 | $ 0.26
Basic - pro forma (post-stock split) (in dollars per share) |  | $ 0.21 | $ 0.09 | $ 0.32 | $ 0.13
Diluted - as reported (pre-stock split) (in dollars per share) |  | $ 0.42 | $ 0.17 | $ 0.62 | $ 0.26
Diluted - pro forma (post-stock split) (in dollars per share) |  | $ 0.21 | $ 0.09 | $ 0.31 | $ 0.13
Weighted-average shares outstanding |  |  |  |  |
Basic - as reported (pre-stock split) (in shares) |  | 210,349,000 | 209,512,000 | 210,250,000 | 209,320,000
Basic - pro forma (post-stock split) (in shares) |  | 420,698,000 | 419,024,000 | 420,500,000 | 418,640,000
Diluted - as reported (pre-stock split) (in shares) |  | 211,745,000 | 211,158,000 | 211,492,000 | 210,974,000
Diluted - pro forma (post-stock split) (in shares) |  | 423,490,000 | 422,316,000 | 422,984,000 | 421,948,000

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from a stock split in which per-share par value or stated value is not changed proportionately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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