Fair Value of Financial Instruments - Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets:
Short-term investments	$ 210.6	$ 201.2
Significant Other Observable Inputs (Level 2)
Liabilities:
Fair value of the long-term fixed interest rate debt	257.6	252.1
Recurring basis
Assets:
Short-term investments	210.6	201.2
Restricted cash	1.7	1.5
Foreign exchange contracts	1.1
Embedded derivatives in purchase and delivery contracts	0.1	0.5
Long-term restricted cash	2.7	2.6
Total assets recorded at fair value	216.2	205.8
Liabilities:
Contingent consideration	4.6	4.6
Foreign exchange contracts	0.2	1.3
Embedded derivatives in purchase and delivery contracts	0.4	0.5
Fixed price commodity contracts	0.3	0.4
Total liabilities recorded at fair value	5.5	6.8
Recurring basis | Quoted Prices in Active Markets Available (Level 1)
Assets:
Short-term investments	210.6	201.2
Restricted cash	1.7	1.5
Long-term restricted cash	2.7	2.6
Total assets recorded at fair value	215.0	205.3
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts	1.1
Embedded derivatives in purchase and delivery contracts	0.1	0.5
Total assets recorded at fair value	1.2	0.5
Liabilities:
Foreign exchange contracts	0.2	1.3
Embedded derivatives in purchase and delivery contracts	0.4	0.5
Fixed price commodity contracts	0.3	0.4
Total liabilities recorded at fair value	0.9	2.2
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	4.6	4.6
Total liabilities recorded at fair value	$ 4.6	$ 4.6