Acquisitions - Allocation of purchase price (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 30, 2018	Aug. 01, 2017
Assets acquired:
Goodwill	$ 413,235	$ 414,122
Halyard's Health And IT System
Assets acquired:
Current assets	330,870
Goodwill	130,364		$ 130,000
Intangible assets	191,230
Other noncurrent assets	218,240
Total assets	870,704
Liabilities assumed:
Current liabilities	92,438
Noncurrent liabilities	20,217
Total liabilities	112,655
Fair value of net assets acquired, net of cash	758,049
Preliminary Fair Value Originally Estimated as of Acquisition Date | Halyard's Health And IT System
Assets acquired:
Current assets				$ 330,870
Goodwill				130,364
Intangible assets				191,230
Other noncurrent assets				218,240
Total assets				870,704
Liabilities assumed:
Current liabilities				92,438
Noncurrent liabilities				20,217
Total liabilities				112,655
Fair value of net assets acquired, net of cash				$ 758,049
Differences Between Prior and Current Period Preliminary Fair Value | Halyard's Health And IT System
Assets acquired:
Current assets	0
Goodwill	0
Intangible assets	0
Other noncurrent assets	0
Total assets	0
Liabilities assumed:
Current liabilities	0
Noncurrent liabilities	0
Total liabilities	0
Fair value of net assets acquired, net of cash	$ 0