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Acquisitions (Details) € in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 03, 2015 USD ($) | Sep. 03, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 EUR (€) | Sep. 03, 2015 EUR (€)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  | $ 260.5 | $ 32.0 | $ 46.3 |  |
Intangible assets acquired during the period |  |  |  | 10.1 |  |  |
Finite-lived intangible assets |  |  | 175.9 | 135.5 |  |  |
Amortization expense 2016 |  |  | 34.8 |  |  |  |
Amortization expense 2017 |  |  | 31.8 |  |  |  |
Amortization expense 2018 |  |  | 29.0 |  |  |  |
Amortization expense 2019 |  |  | 24.7 |  |  |  |
Amortization expense 2020 |  |  | 20.2 |  |  |  |
Goodwill |  |  | 1,257.4 | 1,075.2 | $ 1,090.9 |  |
Goodwill acquired during the period |  |  | $ 228.0 | 39.4 |  |  |
Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life |  |  | 13 years |  |  |  |
Finite-lived intangible assets |  |  | $ 168.9 | $ 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 |  |  | $ 3.4 |  |  |  |
Net acquired assets | 153.0 |  |  |  |  |  | € 136.5
Intangible assets acquired during the period | 48.8 | 43.5 |  |  |  |  |
Goodwill | 119.3 |  |  |  |  |  | € 106.4
7S | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired during the period | $ 44.2 | € 39.4 |  |  |  |  |
Useful life |  |  | 10 years |  |  |  |
Finite-lived intangible assets |  |  | $ 41.4 |  |  | € 38.1 |
Amortization expense 2016 |  |  | 4.3 |  |  |  |
Amortization expense 2017 |  |  | 4.3 |  |  |  |
Amortization expense 2018 |  |  | 4.3 |  |  |  |
Amortization expense 2019 |  |  | 4.3 |  |  |  |
Amortization expense 2020 |  |  | 4.3 |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  | 120.1 |  |  |  |
Intangible assets acquired during the period |  |  | 28.5 |  |  |  |
Goodwill acquired during the period |  |  | $ 108.7 |  |  |  |

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