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

Acceleration of Share-Based compensation expense recognition due to retirements of plan participants

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Share Based Compensation Arrangement by Share-based Payment Award, Award Multiplier

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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Share-based Compensation Arrangement for the Companys Total Shareholder Return Incentive Compensation Plan, Additional Disclosures

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Period Type:	duration

- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: 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 3: 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=6959260&loc=d3e187085-122770

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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