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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 4 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | May 08, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Share-Based Compensation [Abstract] |  |  |  |  |
Fair value of share-based compensation awards, granted | $ 2.5 | $ 2.0 |  | $ 22.8 | $ 18.6
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | $ 46.6 |  |  | $ 46.6 |
Weighted average recognition period for unrecognized compensation expense, in years |  |  |  | 2 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 7 years | 10 years |

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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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