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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 4.4	$ 4.6	$ 4.5	$ 3.7
Assets, Fair Value Disclosure [Abstract]
Business Combination, Contingent Consideration, Liability	0.2	0.2	$ 3.8	$ 3.8
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	4.4	4.6
Trading securities	2.2	2.3
Business Combination, Contingent Consideration, Liability	0.2	0.2
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	0.0
Trading securities	2.2	2.3
Business Combination, Contingent Consideration, Liability	0.0	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	0.0
Trading securities	0.0	0.0
Business Combination, Contingent Consideration, Liability	0.0	0.0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	4.4	4.6
Trading securities	0.0	0.0
Business Combination, Contingent Consideration, Liability	0.2	0.2
Senior Secured Notes Maturing 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	$ 372.6	$ 371.0

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

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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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