Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Short-term investments	$ 113.1
Significant Other Observable Inputs (Level 2)
Liabilities:
Long-term fixed interest rate debt	249.3	244.1
Recurring basis | Total
Assets:
Cash equivalents	114.8	6.8
Short-term investments	113.1
Restricted cash	1.8	2.7
Foreign exchange contracts		2.3
Embedded derivatives in purchase and delivery contracts	0.3	0.2
Fixed price commodity contracts		0.1
Long-term restricted cash	3.8	4.0
Total assets recorded at fair value	233.8	16.1
Liabilities:
Contingent consideration	15.8	7.0
Foreign exchange contracts	7.2
Embedded derivatives in purchase and delivery contracts	0.3	0.4
Fixed price commodity contracts	0.1
Total liabilities recorded at fair value	23.4	7.4
Recurring basis | Quoted Prices in Active Markets Available (Level 1)
Assets:
Cash equivalents	114.8	6.8
Short-term investments	113.1
Restricted cash	1.8	2.7
Long-term restricted cash	3.8	4.0
Total assets recorded at fair value	233.5	13.5
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Foreign exchange contracts		2.3
Embedded derivatives in purchase and delivery contracts	0.3	0.2
Fixed price commodity contracts		0.1
Total assets recorded at fair value	0.3	2.6
Liabilities:
Foreign exchange contracts	7.2
Embedded derivatives in purchase and delivery contracts	0.3	0.4
Fixed price commodity contracts	0.1
Total liabilities recorded at fair value	7.6	0.4
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	15.8	7.0
Total liabilities recorded at fair value	$ 15.8	$ 7.0