Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Short-term investments	$ 67.8
Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term fixed interest rate debt	252.1	244.1
Recurring basis | Total
Assets:
Cash equivalents	109.7	6.8
Short-term investments	67.8
Restricted cash	3.1	2.7
Foreign exchange contracts		2.3
Embedded derivatives in purchase and delivery contracts	0.1	0.2
Fixed price commodity contracts	0.1	0.1
Long-term restricted cash	3.5	4.0
Total assets recorded at fair value	184.3	16.1
Liabilities:
Contingent consideration	6.6	7.0
Foreign exchange contracts	0.9
Embedded derivatives in purchase and delivery contracts	0.3	0.4
Total liabilities recorded at fair value	7.8	7.4
Recurring basis | Quoted Prices in Active Markets Available (Level 1)
Assets:
Cash equivalents	109.7	6.8
Short-term investments	67.8
Restricted cash	3.1	2.7
Long-term restricted cash	3.5	4.0
Total assets recorded at fair value	184.1	13.5
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts		2.3
Embedded derivatives in purchase and delivery contracts	0.1	0.2
Fixed price commodity contracts	0.1	0.1
Total assets recorded at fair value	0.2	2.6
Liabilities:
Foreign exchange contracts	0.9
Embedded derivatives in purchase and delivery contracts	0.3	0.4
Total liabilities recorded at fair value	1.2	0.4
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	6.6	7.0
Total liabilities recorded at fair value	$ 6.6	$ 7.0