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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 4.5	$ 3.7	$ 4.0	$ 2.0
Assets, Fair Value Disclosure [Abstract]
Business Combination, Contingent Consideration, Liability	3.8		24.3
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	4.5	3.7
Trading securities	2.2	2.0
Business Combination, Contingent Consideration, Liability	3.8	3.8
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0	0
Trading securities	2.2	2.0
Business Combination, Contingent Consideration, Liability	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0	0
Trading securities	0	0
Business Combination, Contingent Consideration, Liability	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	4.5	3.7
Trading securities	0	0
Business Combination, Contingent Consideration, Liability	3.8	3.8
Senior Secured Notes Maturing 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	$ 387	$ 390

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value portion of notes payable.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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