Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Basis of Presentation
Increase in costs of services due to out-of-period adjustment	$ 1
Decrease in net income due to out-of-period adjustment	0.6
Decrease in revenues due to out-of-period adjustment	1.3	0.8	0.5
Decrease in net income due to net combined out-of-period adjustments	2.3
Decrease in net income (after tax) due to net combined out-of-period adjustments	$ 1.4

Represents the amount of increase in costs of services due to out-of-period adjustment.

No definition available.

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Represents the after tax amount of decrease in net income due to net combined out-of-period adjustments.

No definition available.

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Represents the before tax amount of decrease in net income due to net combined out-of-period adjustments.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Represents the after tax amount of decrease in net income due to out-of-period adjustment.

No definition available.

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Represents the amount of decrease in revenues due to out-of-period adjustment.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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