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Employee Benefit Plans (Defined Contribution Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension and Other Postretirement Benefit Expense [Abstract]
Employer discretionary contribution, amount	$ 13.3us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 13.0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 11.7us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PensionAndOtherPostretirementBenefitExpenseAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration