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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Preferred stock, issued | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |
Common stock shares available for future awards | 2,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding, beginning of the year (shares) | 107,000 | 427,000 | 600,000
Granted (shares) | 0 | 0 | 0
Exercised (shares) | (91,000) | (319,000) | (171,000)
Canceled (shares) | (1,000) | (1,000) | (2,000)
Outstanding, end of the year (shares) | 15,000 | 107,000 | 427,000
Exercisable at end of year (shares) | 15,000 | 107,000 | 427,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Beginning balance (in dollars per share) | $ 9.33 | $ 7.51 | $ 8.11
Granted (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00
Exercised (in dollars per share) | $ 4.03 | $ 6.89 | $ 9.53
Canceled (in dollars per share) | $ 3.90 | $ 9.66 | $ 16.52
Ending balance (in dollars per share) | $ 42.21 | $ 9.33 | $ 7.51
Exercisable at end of year (in dollars per share) | $ 42.21 | $ 9.33 | $ 7.51
Aggregate intrinsic value of options outstanding | $ 0.2 |  |
Average remaining contractual life of options outstanding and exercisable | 1 year 6 months |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
PRSP shares vested during current period | 333,000 | 343,000 | 616,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Nonvested beginning of the year (shares) | 727,000 | 677,000 | 976,000
Granted (shares) | 576,000 | 394,000 | 319,000
Vested (shares) | (333,000) | (343,000) | (616,000)
Forfeited (shares) | (43,000) | (1,000) | (2,000)
Nonvested end of the year (shares) | 927,000 | 727,000 | 677,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Beginning balance (in dollars per share) | 38.6 | 36.4 | 33.3
Granted (in dollars per share) | 16.4 | 16.4 | 19.5
Vested (in dollars per share) | (16.4) | (14.1) | (16.3)
Forfeited (in dollars per share) | (1.7) | (0.1) | (0.1)
Ending balance (in dollars per share) | 36.9 | 38.6 | 36.4
Retained Earnings Note Disclosure [Abstract] |  |  |
Undistributed earnings of investees accounted for under equity method | 21 |  |
Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Income target attainment measurement period | 3 years |  |
Share based compensation expense | 11.3 | 14.0 | 19.7
Accelerated share based compensation expense | 1.5 |  | 3.4
Unrecognized compensation expense | 10.5 |  |
TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation expense | 12.3 | 19.2 | 24.2
Performance measurement period | 3 years |  |
Incremental cost of plan modifications |  | 1.5 | 5.0
Unrecognized compensation expense | 10.5 |  |
TSRP Minimum Shares | 0 |  |
TSRP Target Shares | 662,000 |  |
TSRP Maximum Shares | 1,482,000 |  |
PRSP 2011 [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
PRSP shares vested during current period | 250,347 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Vested (shares) | (250,347) |  |
PRSP 2008 [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
PRSP shares vested during current period | 66,522 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Vested (shares) | (66,522) |  |
TSRP 2011-2013 [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
PRSP shares vested during current period | 83,515 |  |
TSRP Award Fair Value | 20.1 |  |
Unrecognized compensation expense | 0 |  |
TSRP Minimum Shares | 0 |  |
TSRP Target Shares | 158,000 |  |
TSRP Maximum Shares | 473,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Vested (shares) | (83,515) |  |
TSRP 2012-2014 [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
TSRP Award Fair Value | 8.7 |  |
Unrecognized compensation expense | 2.9 |  |
TSRP Minimum Shares | 0 |  |
TSRP Target Shares | 184,000 |  |
TSRP Maximum Shares | 368,000 |  |
TSRP 2013-2015 [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Target share award level | 381,324 |  |
TSRP Award Fair Value | 11.4 |  |
Unrecognized compensation expense | $ 7.6 |  |
TSRP Minimum Shares | 0 |  |
TSRP Target Shares | 320,000 |  |
TSRP Maximum Shares | 641,000 |  |
Maximum [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Maximum [Member] | PRSP 2013 [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Maximum [Member] | PRSP 2008 [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Maximum [Member] | TSRP 2011-2013 [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award multiplier | 3 |  |
Maximum [Member] | TSRP 2013-2015 [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award multiplier | 2 |  |
Minimum [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Minimum [Member] | TSRP Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award multiplier | 0 |  |
Minimum [Member] | PRSP 2012 [Member] | Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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