Fair Value of Financial Instruments (Fair Value of Financial Instruments, Recurring Basis Measurements) (Narrative) (Details) - Earn-Out Arrangements [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Additions from new business combinations, ASC 805 contingent consideration	$ 0.0	$ 24.9	$ 0.0	$ 33.6
Payments of ASC 805 contingent consideration	32.2	47.0	32.2	47.0
Other Income [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Reduction in ASC 805 contingent consideration, gain included in earnings	3.6
Foreign Currency Translation Adjustments [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Foreign currency translation (losses) gains, other comprehensive income, ASC 805 contingent consideration	(1.0)	$ (1.7)	3.6	$ (0.4)
Level 3 [Member] | Fair Value [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	$ 106.7		$ 106.7		$ 146.1
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Fair value measurements, valuation techniques			The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis.