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Acquisitions (Details) € in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 03, 2015 USD ($) | Sep. 03, 2015 EUR (€) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 EUR (€) | Sep. 03, 2015 EUR (€) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  | $ 240.7 | $ 25.1 |  |  |
Finite-lived intangible assets |  |  | $ 180.9 | 180.9 |  |  |  | $ 135.5
Amortization expense 2015 |  |  | 9.7 | 9.7 |  |  |  |
Amortization expense 2016 |  |  | 34.9 | 34.9 |  |  |  |
Amortization expense 2017 |  |  | 31.8 | 31.8 |  |  |  |
Amortization expense 2018 |  |  | 28.7 | 28.7 |  |  |  |
Amortization expense 2019 |  |  | 24.1 | 24.1 |  |  |  |
Amortization expense 2020 |  |  | 19.6 | 19.6 |  |  |  |
Goodwill |  |  | 1,243.4 | 1,243.4 |  |  |  | 1,075.2
Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | 172.2 | 172.2 |  |  |  | $ 134.3
7S |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired | $ 140.4 | € 125.3 |  |  |  |  |  |
Transaction costs associated with acquisition |  |  | 2.2 | $ 3.4 |  |  |  |
Net acquired assets | 153.0 |  |  |  |  |  | € 136.5 |
Acquired finite-lived intangible assets | 49.1 | 43.8 |  |  |  |  |  |
Goodwill | 118.3 |  |  |  |  |  | € 105.6 |
7S | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets | $ 44.2 | € 39.4 |  |  |  |  |  |
Finite-lived intangible assets amortization period |  |  |  | 10 years |  |  |  |
Finite-lived intangible assets |  |  | 43.6 | $ 43.6 |  | € 39.0 |  |
Amortization expense 2015 |  |  | 1.0 | 1.0 |  |  |  |
Amortization expense 2016 |  |  | 4.5 | 4.5 |  |  |  |
Amortization expense 2017 |  |  | 4.5 | 4.5 |  |  |  |
Amortization expense 2018 |  |  | 4.5 | 4.5 |  |  |  |
Amortization expense 2019 |  |  | 4.5 | 4.5 |  |  |  |
Amortization expense 2020 |  |  | $ 4.5 | 4.5 |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  | $ 100.3 | $ 25.1 |  |  |

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