Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets:
Short-term investments	$ 201.3	$ 178.0
Significant Other Observable Inputs (Level 2)
Liabilities:
Fair value of the long-term fixed interest rate debt	254.0	257.2
Recurring basis
Assets:
Cash equivalents		67.9
Short-term investments	201.3	178.0
Restricted cash	0.7	1.8
Foreign exchange contracts	1.3
Embedded derivatives in purchase and delivery contracts	0.4	0.6
Long-term restricted cash	2.8	3.4
Total assets recorded at fair value	206.5	251.7
Liabilities:
Contingent consideration	5.2	11.9
Foreign exchange contracts	0.6	5.1
Embedded derivatives in purchase and delivery contracts	0.4	0.4
Fixed price commodity contracts	0.4	0.2
Total liabilities recorded at fair value	6.6	17.6
Recurring basis | Quoted Prices in Active Markets Available (Level 1)
Assets:
Cash equivalents		67.9
Short-term investments	201.3	178.0
Restricted cash	0.7	1.8
Long-term restricted cash	2.8	3.4
Total assets recorded at fair value	204.8	251.1
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts	1.3
Embedded derivatives in purchase and delivery contracts	0.4	0.6
Total assets recorded at fair value	1.7	0.6
Liabilities:
Foreign exchange contracts	0.6	5.1
Embedded derivatives in purchase and delivery contracts	0.4	0.4
Fixed price commodity contracts	0.4	0.2
Total liabilities recorded at fair value	1.4	5.7
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	5.2	11.9
Total liabilities recorded at fair value	$ 5.2	$ 11.9