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Research and Development Expenditures (Tables) | 9 Months Ended
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Sep. 30, 2015
Research and Development [Abstract] |
Gross and net expenditures on research and development ("R&D") activities | The following table presents the Company’s gross and net expenditures on R&D activities:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2015 |  | 2014 |  | 2015 |  | 2014
Gross R&D expenditures | $ | 95.6 |  |  | $ | 96.1 |  |  | $ | 282.2 |  |  | $ | 292.1 |
Customer reimbursements | (20.4 | ) |  | (10.8 | ) |  | (51.5 | ) |  | (34.7 | )
Net R&D expenditures | $ | 75.2 |  |  | $ | 85.3 |  |  | $ | 230.7 |  |  | $ | 257.4 |

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