Fair Value of Financial Instruments - Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Significant Other Observable Inputs (Level 2)
Liabilities:
Fair value of long-term fixed interest rate debt	$ 227.6	$ 231.3
Recurring basis
Assets:
Embedded derivatives in purchase and delivery contracts	1.3	0.9
Foreign exchange contracts	0.1	4.5
Fixed price commodity contracts	0.2	0.8
Total assets recorded at fair value	1.6	6.2
Liabilities:
Contingent consideration	13.5	12.7
Foreign exchange contracts	0.1	0.1
Embedded derivatives in purchase and delivery contracts	3.2	2.9
Total liabilities recorded at fair value	16.8	15.7
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Embedded derivatives in purchase and delivery contracts	1.3	0.9
Foreign exchange contracts	0.1	4.5
Fixed price commodity contracts	0.2	0.8
Total assets recorded at fair value	1.6	6.2
Liabilities:
Foreign exchange contracts	0.1	0.1
Embedded derivatives in purchase and delivery contracts	3.2	2.9
Total liabilities recorded at fair value	3.3	3.0
Recurring basis | Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	13.5	12.7
Total liabilities recorded at fair value	$ 13.5	$ 12.7