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	Dec. 31, 2016	Dec. 31, 2015
Estimated fair value
Financial assets:
Contingent consideration receivable	$ 15.6	$ 13.8
Derivative contracts	18.0	1.9
Total	114.9	32.9
Financial liabilities:
Derivative contracts	8.3	11.5
Contingent consideration payable	1,058.0	475.9
Total	1,066.3	487.4
Level 1
Financial assets:
Contingent consideration receivable	0.0	0.0
Derivative contracts	0.0	0.0
Total	69.4	17.2
Financial liabilities:
Derivative contracts	0.0	0.0
Contingent consideration payable	0.0	0.0
Total	0.0	0.0
Level 2
Financial assets:
Contingent consideration receivable	0.0	0.0
Derivative contracts	18.0	1.9
Total	29.9	1.9
Financial liabilities:
Derivative contracts	8.3	11.5
Contingent consideration payable	0.0	0.0
Total	8.3	11.5
Level 3
Financial assets:
Contingent consideration receivable	15.6	13.8
Derivative contracts	0.0	0.0
Total	15.6	13.8
Financial liabilities:
Derivative contracts	0.0	0.0
Contingent consideration payable	1,058.0	475.9
Total	1,058.0	475.9
Marketable equity securities | Estimated fair value
Financial assets:
Marketable securities	65.8	17.2
Marketable equity securities | Level 1
Financial assets:
Marketable securities	65.8	17.2
Marketable equity securities | Level 2
Financial assets:
Marketable securities	0.0	0.0
Marketable equity securities | Level 3
Financial assets:
Marketable securities	0.0	$ 0.0
Marketable debt securities | Estimated fair value
Financial assets:
Marketable securities	15.5
Marketable debt securities | Level 1
Financial assets:
Marketable securities	3.6
Marketable debt securities | Level 2
Financial assets:
Marketable securities	11.9
Marketable debt securities | Level 3
Financial assets:
Marketable securities	$ 0.0