Fair Value of Financial Instruments - Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Assets:
Short-term investments	$ 201.2	$ 178.0
Significant Other Observable Inputs (Level 2)
Liabilities:
Fair value of the long-term fixed interest rate debt	252.1	257.2
Recurring basis
Assets:
Cash equivalents		67.9
Short-term investments	201.2	178.0
Restricted cash	1.5	1.8
Embedded derivatives in purchase and delivery contracts	0.5	0.6
Long-term restricted cash	2.6	3.4
Total assets recorded at fair value	205.8	251.7
Liabilities:
Contingent consideration	4.6	11.9
Foreign exchange contracts	1.3	5.1
Embedded derivatives in purchase and delivery contracts	0.5	0.4
Fixed price commodity contracts	0.4	0.2
Total liabilities recorded at fair value	6.8	17.6
Recurring basis | Quoted Prices in Active Markets Available (Level 1)
Assets:
Cash equivalents		67.9
Short-term investments	201.2	178.0
Restricted cash	1.5	1.8
Long-term restricted cash	2.6	3.4
Total assets recorded at fair value	205.3	251.1
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Embedded derivatives in purchase and delivery contracts	0.5	0.6
Total assets recorded at fair value	0.5	0.6
Liabilities:
Foreign exchange contracts	1.3	5.1
Embedded derivatives in purchase and delivery contracts	0.5	0.4
Fixed price commodity contracts	0.4	0.2
Total liabilities recorded at fair value	2.2	5.7
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	4.6	11.9
Total liabilities recorded at fair value	$ 4.6	$ 11.9