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Research and Development Expenditures (Tables) | 9 Months Ended
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Sep. 30, 2018
Research and Development [Abstract] |
Gross and net expenditures on research and development ("R&D") activities |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Gross R&D expenditures | $ | 121.8 |  |  | $ | 115.2 |  |  | $ | 385.9 |  |  | $ | 346.9 |
Customer reimbursements | (13.8 | ) |  | (13.7 | ) |  | (48.8 | ) |  | (44.1 | )
Net R&D expenditures | $ | 108.0 |  |  | $ | 101.5 |  |  | $ | 337.1 |  |  | $ | 302.8 |

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