Fair Value Measurement (Assets and Liabilities That are Measured and Not Measured at Fair Value on a Recurring Basis) (Details) - Recurring Basis - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Estimated fair value
Financial assets:
Available-for-sale securities	[1]	$ 14.4	$ 13.1
Contingent consideration receivable	[2]	14.9	15.9
Foreign exchange contracts, asset		1.8	12.6
Financial liabilities:
Foreign exchange contracts, liability		9.1	7.8
Contingent consideration payable	[3]	520.6	629.9
Level 1
Financial assets:
Available-for-sale securities	[1]	14.4	13.1
Contingent consideration receivable	[2]	0.0	0.0
Foreign exchange contracts, asset		0.0	0.0
Financial liabilities:
Foreign exchange contracts, liability		0.0	0.0
Contingent consideration payable	[3]	0.0	0.0
Level 2
Financial assets:
Available-for-sale securities	[1]	0.0	0.0
Contingent consideration receivable	[2]	0.0	0.0
Foreign exchange contracts, asset		1.8	12.6
Financial liabilities:
Foreign exchange contracts, liability		9.1	7.8
Contingent consideration payable	[3]	0.0	0.0
Level 3
Financial assets:
Available-for-sale securities	[1]	0.0	0.0
Contingent consideration receivable	[2]	14.9	15.9
Foreign exchange contracts, asset		0.0	0.0
Financial liabilities:
Foreign exchange contracts, liability		0.0	0.0
Contingent consideration payable	[3]	$ 520.6	$ 629.9

[1] Available-for-sale securities are included within Investments in the consolidated balance sheet.

[2] Contingent consideration receivable is included within Prepaid expenses and other current assets and Other non-current assets in the consolidated balance sheet.

[3] Contingent consideration payable is included within Other current liabilities and Other non-current liabilities in the consolidated balance sheet.