Holcim Chairman Rolf Soiron & Lafarge CEO Bruno Lafont

Holcim Chairman Rolf Soiron & Lafarge CEO Bruno Lafont

Alessandro Della Bella/Bloomberg

Rolf Soiron, chairman of Holcim Ltd., left, shuffles his papers as Bruno Lafont, chief executive officer of Lafarge SA, speaks during a news conference in Zurich on April 7, 2014.